diff --git a/nvm.sh b/nvm.sh
index faa840a..a64ae36 100644
--- a/nvm.sh
+++ b/nvm.sh
@@ -643,12 +643,68 @@ nvm_get_arch() {
   echo "$NVM_ARCH"
 }
 
+nvm_install_iojs_binary() {
+  local PREFIXED_VERSION
+  PREFIXED_VERSION="$1"
+  local REINSTALL_PACKAGES_FROM
+  REINSTALL_PACKAGES_FROM="$2"
+
+  if ! nvm_is_iojs_version "$PREFIXED_VERSION"; then
+    echo 'nvm_install_iojs_binary requires an iojs-prefixed version.' >&2
+    return 10
+  fi
+
+  local VERSION
+  VERSION="$(nvm_strip_iojs_prefix "$PREFIXED_VERSION")"
+  local VERSION_PATH
+  VERSION_PATH="$(nvm_version_path "$PREFIXED_VERSION")"
+  local NVM_OS
+  NVM_OS="$(nvm_get_os)"
+  local t
+  local url
+  local sum
+
+  if [ -n "$NVM_OS" ]; then
+    if nvm_binary_available "$VERSION"; then
+      t="$VERSION-$NVM_OS-$(nvm_get_arch)"
+      url="$NVM_IOJS_ORG_MIRROR/$VERSION/$(nvm_iojs_prefix)-${t}.tar.gz"
+      sum="$(nvm_download -L -s $NVM_IOJS_ORG_MIRROR/$VERSION/SHASUMS256.txt -o - | command grep $(nvm_iojs_prefix)-${t}.tar.gz | command awk '{print $1}')"
+      local tmpdir
+      tmpdir="$NVM_DIR/bin/iojs-${t}"
+      local tmptarball
+      tmptarball="$tmpdir/iojs-${t}.tar.gz"
+      if (
+        command mkdir -p "$tmpdir" && \
+        nvm_download -L -C - --progress-bar $url -o "$tmptarball" && \
+        echo "WARNING: checksums are currently disabled for io.js" >&2 && \
+        # nvm_checksum "$tmptarball" $sum && \
+        command tar -xzf "$tmptarball" -C "$tmpdir" --strip-components 1 && \
+        command rm -f "$tmptarball" && \
+        command mkdir -p "$VERSION_PATH" && \
+        command mv "$tmpdir"/* "$VERSION_PATH"
+      ); then
+        return 0
+      else
+        echo "Binary download failed, trying source." >&2
+        command rm -rf "$tmptarball" "$tmpdir"
+        return 1
+      fi
+    fi
+  fi
+  return 2
+}
+
 nvm_install_node_binary() {
   local VERSION
   VERSION="$1"
   local REINSTALL_PACKAGES_FROM
   REINSTALL_PACKAGES_FROM="$2"
 
+  if nvm_is_iojs_version "$PREFIXED_VERSION"; then
+    echo 'nvm_install_node_binary does not allow an iojs-prefixed version.' >&2
+    return 10
+  fi
+
   local VERSION_PATH
   VERSION_PATH="$(nvm_version_path "$VERSION")"
   local NVM_OS
@@ -672,9 +728,9 @@ nvm_install_node_binary() {
         nvm_checksum "$tmptarball" $sum && \
         command tar -xzf "$tmptarball" -C "$tmpdir" --strip-components 1 && \
         command rm -f "$tmptarball" && \
-        command mv "$tmpdir" "$VERSION_PATH"
-        )
-      then
+        command mkdir -p "$VERSION_PATH" && \
+        command mv "$tmpdir"/* "$VERSION_PATH"
+      ); then
         return 0
       else
         echo "Binary download failed, trying source." >&2
@@ -900,7 +956,7 @@ nvm() {
       fi
 
       local NVM_IOJS
-      if nvm_is_iojs_version "$VERSION"; then
+      if nvm_is_iojs_version "$VERSION" || [ "_$VERSION" = "_$(nvm_iojs_prefix)" ]; then
         NVM_IOJS=true
       fi
 
@@ -912,8 +968,16 @@ nvm() {
         nobinary=1
       fi
       # skip binary install if "nobinary" option specified.
-      if [ $nobinary -ne 1 ] && nvm_install_node_binary "$VERSION" "$REINSTALL_PACKAGES_FROM"; then
-        if nvm use "$VERSION" \
+      if [ $nobinary -ne 1 ] && nvm_binary_available "$VERSION"; then
+        local NVM_INSTALL_SUCCESS
+        if [ "$NVM_IOJS" = true ] && nvm_install_iojs_binary "$VERSION" "$REINSTALL_PACKAGES_FROM"; then
+          NVM_INSTALL_SUCCESS=true
+        elif [ "$NVM_IOJS" != true ] && nvm_install_node_binary "$VERSION" "$REINSTALL_PACKAGES_FROM"; then
+          NVM_INSTALL_SUCCESS=true
+        fi
+
+        if [ "$NVM_INSTALL_SUCCESS" = true ] \
+          && nvm use "$VERSION" \
           && [ ! -z "$REINSTALL_PACKAGES_FROM" ] \
           && [ "_$REINSTALL_PACKAGES_FROM" != "_N/A" ]; then
           nvm reinstall-packages "$REINSTALL_PACKAGES_FROM"
@@ -921,7 +985,13 @@ nvm() {
         return $?
       fi
 
-      nvm_install_node_source "$VERSION" "$REINSTALL_PACKAGES_FROM" "$ADDITIONAL_PARAMETERS"
+      if [ "$NVM_IOJS" = true ]; then
+        # nvm_install_iojs_source "$VERSION" "$REINSTALL_PACKAGES_FROM" "$ADDITIONAL_PARAMETERS"
+        echo "Installing iojs from source is not currently supported" >&2
+        return 105
+      else
+        nvm_install_node_source "$VERSION" "$REINSTALL_PACKAGES_FROM" "$ADDITIONAL_PARAMETERS"
+      fi
     ;;
     "uninstall" )
       [ $# -ne 2 ] && nvm help && return
diff --git a/test/installation/io.js/install already installed uses it b/test/installation/io.js/install already installed uses it
new file mode 100755
index 0000000..07e5487
--- /dev/null
+++ b/test/installation/io.js/install already installed uses it	
@@ -0,0 +1,26 @@
+#!/bin/sh
+
+die () { echo $@ ; exit 1; }
+
+. ../../../nvm.sh
+
+[ "$(nvm install invalid.invalid 2>&1)" = "Version 'invalid.invalid' not found - try \`nvm ls-remote\` to browse available versions." ] || die "nvm installing an invalid version did not print a nice error message"
+
+# Remove the stuff we're clobbering.
+[ -e ../../../versions/io.js/v1.0.0 ] && rm -R ../../../versions/io.js/v1.0.0
+[ -e ../../../versions/io.js/v1.0.1 ] && rm -R ../../../versions/io.js/v1.0.1
+
+# Install from binary
+nvm install iojs-v1.0.0
+nvm install iojs-v1.0.1
+
+nvm use iojs-v1.0.0
+
+node --version | grep v1.0.0 || die "precondition failed: iojs node doesn't start at v1.0.0"
+iojs --version | grep v1.0.0 || die "precondition failed: iojs binary doesn't start at v1.0.0"
+
+nvm install iojs-v1.0.1
+
+node --version | grep v1.0.1 || die "nvm install on already installed version doesn't use it (node binary)"
+iojs --version | grep v1.0.1 || die "nvm install on already installed version doesn't use it (iojs binary)"
+
diff --git a/test/installation/io.js/install from binary b/test/installation/io.js/install from binary
new file mode 100755
index 0000000..12cf963
--- /dev/null
+++ b/test/installation/io.js/install from binary	
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+die () { echo $@ ; exit 1; }
+
+. ../../../nvm.sh
+
+NVM_TEST_VERSION="v1.0.0"
+NVM_PREFIXED_TEST_VERSION="iojs-$NVM_TEST_VERSION"
+
+# Remove the stuff we're clobbering.
+[ -e ../../../$NVM_TEST_VERSION ] && rm -R ../../../$NVM_TEST_VERSION
+
+# Install from binary
+nvm install $NVM_PREFIXED_TEST_VERSION || die "install $NVM_PREFIXED_TEST_VERSION failed"
+
+# Check
+[ -d ../../../versions/io.js/$NVM_TEST_VERSION ]
+nvm run $NVM_PREFIXED_TEST_VERSION --version | grep $NVM_TEST_VERSION || die "'nvm run $NVM_PREFIXED_TEST_VERSION --version | grep $NVM_TEST_VERSION' failed"
+
diff --git a/test/installation/io.js/install two versions and use the latest one b/test/installation/io.js/install two versions and use the latest one
new file mode 100755
index 0000000..7b60d74
--- /dev/null
+++ b/test/installation/io.js/install two versions and use the latest one	
@@ -0,0 +1,26 @@
+#!/bin/sh
+
+die () { echo $@ ; exit 1; }
+
+. ../../../nvm.sh
+
+# Remove the stuff we're clobbering.
+[ -e ../../../versions/io.js/v1.0.0 ] && rm -R ../../../versions/io.js/v1.0.0
+[ -e ../../../versions/io.js/v1.0.1 ] && rm -R ../../../versions/io.js/v1.0.1
+
+# Install from binary
+nvm install iojs-v1.0.0 || die "'nvm install iojs-v1.0.0' failed"
+nvm i iojs-v1.0.1 || die "'nvm i iojs-v1.0.1' failed"
+
+# Check
+[ -d ../../../versions/io.js/v1.0.0 ] || die "iojs v1.0.0 didn't exist"
+[ -d ../../../versions/io.js/v1.0.1 ] || die "iojs v1.0.1 didn't exist"
+
+# Use the first one
+nvm use iojs-1.0.0 || die "'nvm use iojs-1.0.0' failed"
+
+# Use the latest one
+nvm use iojs-1 || die "'nvm use iojs-1' failed"
+[ "_$(node --version)" = "_v1.0.1" ] || die "'node --version' was not v1.0.1, got: $(node --version)"
+[ "_$(iojs --version)" = "_v1.0.1" ] || die "'iojs --version' was not v1.0.1, got: $(iojs --version)"
+
diff --git a/test/installation/io.js/install version specified in .nvmrc from binary b/test/installation/io.js/install version specified in .nvmrc from binary
new file mode 100755
index 0000000..dfab909
--- /dev/null
+++ b/test/installation/io.js/install version specified in .nvmrc from binary	
@@ -0,0 +1,24 @@
+#!/bin/sh
+
+die () { echo $@ ; exit 1; }
+
+. ../../../nvm.sh
+
+NVM_TEST_VERSION=v1.0.0
+NVM_PREFIXED_TEST_VERSION="iojs-$NVM_TEST_VERSION"
+VERSION_PATH="../../../versions/io.js/$NVM_TEST_VERSION"
+
+# Remove the stuff we're clobbering.
+[ -e $VERSION_PATH ] && rm -R $VERSION_PATH
+
+# Install from binary
+echo "$NVM_PREFIXED_TEST_VERSION" > .nvmrc
+
+nvm install || die "'nvm install' failed"
+
+# Check
+[ -d $VERSION_PATH ] || die "./$VERSION_PATH did not exist"
+nvm run $NVM_PREFIXED_TEST_VERSION --version | grep $NVM_TEST_VERSION \
+  || "'nvm run $NVM_PREFIXED_TEST_VERSION --version | grep $NVM_TEST_VERSION' failed"
+
+
diff --git a/test/installation/io.js/install while reinstalling packages b/test/installation/io.js/install while reinstalling packages
new file mode 100755
index 0000000..d7d4ee4
--- /dev/null
+++ b/test/installation/io.js/install while reinstalling packages	
@@ -0,0 +1,32 @@
+#!/bin/sh
+
+die () { echo $@ ; exit 1; }
+
+. ../../../nvm.sh
+
+# Remove the stuff we're clobbering.
+[ -e ../../../versions/io.js/v1.0.0 ] && rm -R ../../../versions/io.js/v1.0.0
+[ -e ../../../versions/io.js/v1.0.1 ] && rm -R ../../../versions/io.js/v1.0.1
+
+# Install from binary
+nvm install iojs-v1.0.0
+
+# Check
+[ -d ../../../versions/io.js/v1.0.0 ] || die "nvm install iojs-v1.0.0 didn't install"
+
+node --version | grep v1.0.0 > /dev/null || die "nvm install didn't use iojs-v1.0.0"
+
+npm install -g is-nan@1.0.1 || die "npm install -g is-nan failed"
+npm list --global | grep is-nan > /dev/null || die "is-nan isn't installed"
+
+nvm ls iojs-1 | grep iojs-v1.0.0 > /dev/null || die "nvm ls iojs-1 didn't show iojs-v1.0.0"
+
+nvm install iojs-v1.0.1 --reinstall-packages-from=iojs-1.0.0 || die "nvm install iojs-v1.0.1 --reinstall-packages-from=iojs-1.0.0 failed"
+
+[ -d ../../../versions/io.js/v1.0.1 ] || die "nvm install iojs-v1.0.1 didn't install"
+
+nvm use iojs-1
+node --version | grep v1.0.1 > /dev/null || die "nvm use iojs-1 didn't use v1.0.1"
+
+npm list --global | grep is-nan > /dev/null || die "is-nan isn't installed"
+
diff --git a/test/installation/io.js/setup_dir b/test/installation/io.js/setup_dir
new file mode 100755
index 0000000..50dc4e4
--- /dev/null
+++ b/test/installation/io.js/setup_dir
@@ -0,0 +1,6 @@
+#!/bin/sh
+
+if [ -f ".nvmrc" ]; then
+  mv .nvmrc .nvmrc.bak
+fi
+
diff --git a/test/installation/io.js/teardown_dir b/test/installation/io.js/teardown_dir
new file mode 100755
index 0000000..a7e6f3e
--- /dev/null
+++ b/test/installation/io.js/teardown_dir
@@ -0,0 +1,14 @@
+#!/bin/sh
+
+. ../../../nvm.sh
+nvm deactivate
+nvm uninstall iojs-v1.0.0
+
+if [ -f ".nvmrc" ]; then
+  rm .nvmrc
+fi
+
+if [ -f ".nvmrc.bak" ]; then
+  mv .nvmrc.bak .nvmrc
+fi
+
diff --git a/test/slow/node 0.6.21 should install 0.6.21-pre b/test/slow/node 0.6.21 should install 0.6.21-pre
index c579e16..93afff7 100755
--- a/test/slow/node 0.6.21 should install 0.6.21-pre	
+++ b/test/slow/node 0.6.21 should install 0.6.21-pre	
@@ -5,6 +5,6 @@ die () { echo $@ ; exit 1; }
 . ../../nvm.sh
 
 nvm install 0.6.21 || die 'v0.6.21 installation failed'
-[ "$(node -v)" = "v0.6.21-pre" ] || die "v0.6.21-pre not installed with v0.6.21, got $(node -v)"
-[ "$(nvm current)" = "v0.6.21" ] || die "v0.6.21-pre not reported as v0.6.21, got $(nvm current)"
+[ "_$(node -v)" = "_v0.6.21-pre" ] || die "v0.6.21-pre not installed with v0.6.21, got $(node -v)"
+[ "_$(nvm current)" = "_v0.6.21" ] || die "v0.6.21-pre not reported as v0.6.21, got $(nvm current)"