diff --git a/bin/composer b/bin/composer
index ddc04b627..c08194cac 100755
--- a/bin/composer
+++ b/bin/composer
@@ -35,6 +35,7 @@ $dm->setDownloader('zip',  new Downloader\ZipDownloader());
 // initialize installation manager
 $im = new Installer\InstallationManager();
 $im->addInstaller(new Installer\LibraryInstaller($vendorPath, $dm, $rm->getLocalRepository(), null));
+$im->addInstaller(new Installer\InstallerInstaller($vendorPath, $dm, $rm->getLocalRepository(), $im));
 
 // load package
 $loader  = new Package\Loader\ArrayLoader($rm);
diff --git a/src/Composer/Autoload/AutoloadGenerator.php b/src/Composer/Autoload/AutoloadGenerator.php
index ea705b811..2eab9176f 100644
--- a/src/Composer/Autoload/AutoloadGenerator.php
+++ b/src/Composer/Autoload/AutoloadGenerator.php
@@ -24,18 +24,7 @@ use Composer\Repository\RepositoryInterface;
  */
 class AutoloadGenerator
 {
-    private $localRepo;
-    private $package;
-    private $installationManager;
-
-    public function __construct(RepositoryInterface $localRepo, PackageInterface $package, InstallationManager $installationManager)
-    {
-        $this->localRepo = $localRepo;
-        $this->package = $package;
-        $this->installationManager = $installationManager;
-    }
-
-    public function dump($targetDir)
+    public function dump(RepositoryInterface $localRepo, PackageInterface $package, InstallationManager $installationManager, $targetDir)
     {
         $autoloadFile = file_get_contents(__DIR__.'/ClassLoader.php');
 
@@ -69,7 +58,19 @@ return array(
 
 EOF;
 
-        $autoloads = $this->parseAutoloads();
+        // build package => install path map
+        $packageMap = array();
+        foreach ($localRepo->getPackages() as $package) {
+            $packageMap[] = array(
+                $package,
+                $installationManager->getInstallPath($package)
+            );
+        }
+
+        // add main package
+        $packageMap[] = array($package, '');
+
+        $autoloads = $this->parseAutoloads($packageMap);
 
         if (isset($autoloads['psr-0'])) {
             foreach ($autoloads['psr-0'] as $def) {
@@ -85,19 +86,16 @@ EOF;
         file_put_contents($targetDir.'/autoload_namespaces.php', $namespacesFile);
     }
 
-    private function parseAutoloads()
+    /**
+     * Compiles an ordered list of namespace => path mappings
+     *
+     * @param array $packageMap array of array(package, installDir-relative-to-composer.json)
+     * @return array array('psr-0' => array(array('namespace' => 'Foo', 'path' => 'installDir')))
+     */
+    public function parseAutoloads(array $packageMap)
     {
-        $installPaths = array();
-        foreach ($this->localRepo->getPackages() as $package) {
-            $installPaths[] = array(
-                $package,
-                $this->installationManager->getInstallPath($package)
-            );
-        }
-        $installPaths[] = array($this->package, '');
-
         $autoloads = array();
-        foreach ($installPaths as $item) {
+        foreach ($packageMap as $item) {
             list($package, $installPath) = $item;
 
             if (null !== $package->getTargetDir()) {
@@ -122,4 +120,23 @@ EOF;
 
         return $autoloads;
     }
+
+    /**
+     * Registers an autoloader based on an autoload map returned by parseAutoloads
+     *
+     * @param array $autoloads see parseAutoloads return value
+     * @return ClassLoader
+     */
+    public function createLoader(array $autoloads)
+    {
+        $loader = new ClassLoader();
+
+        if (isset($autoloads['psr-0'])) {
+            foreach ($autoloads['psr-0'] as $def) {
+                $loader->add($def['namespace'], '.'.$def['path']);
+            }
+        }
+
+        return $loader;
+    }
 }
diff --git a/src/Composer/Command/InstallCommand.php b/src/Composer/Command/InstallCommand.php
index 55cb2d8e1..a632a3255 100644
--- a/src/Composer/Command/InstallCommand.php
+++ b/src/Composer/Command/InstallCommand.php
@@ -153,8 +153,8 @@ EOT
         $localRepo->write();
 
         $output->writeln('> Generating autoload files');
-        $generator = new AutoloadGenerator($localRepo, $composer->getPackage(), $installationManager);
-        $generator->dump('vendor/.composer/');
+        $generator = new AutoloadGenerator;
+        $generator->dump($localRepo, $composer->getPackage(), $installationManager, 'vendor/.composer/');
 
         $output->writeln('> Done');
     }
diff --git a/src/Composer/Installer/InstallerInstaller.php b/src/Composer/Installer/InstallerInstaller.php
new file mode 100644
index 000000000..c7900059b
--- /dev/null
+++ b/src/Composer/Installer/InstallerInstaller.php
@@ -0,0 +1,94 @@
+<?php
+
+/*
+ * This file is part of Composer.
+ *
+ * (c) Nils Adermann <naderman@naderman.de>
+ *     Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Composer\Installer;
+
+use Composer\Autoload\AutoloadGenerator;
+use Composer\Downloader\DownloadManager;
+use Composer\Repository\WritableRepositoryInterface;
+use Composer\DependencyResolver\Operation\OperationInterface;
+use Composer\Package\PackageInterface;
+
+/**
+ * Installer installation manager.
+ *
+ * @author Jordi Boggiano <j.boggiano@seld.be>
+ */
+class InstallerInstaller extends LibraryInstaller
+{
+    private $installationManager;
+
+    /**
+     * @param   string                      $dir        relative path for packages home
+     * @param   DownloadManager             $dm         download manager
+     * @param   WritableRepositoryInterface $repository repository controller
+     */
+    public function __construct($directory, DownloadManager $dm, WritableRepositoryInterface $repository, InstallationManager $im)
+    {
+        parent::__construct($directory, $dm, $repository, 'composer-installer');
+        $this->installationManager = $im;
+
+        foreach ($repository->getPackages() as $package) {
+            $this->registerInstaller($package);
+        }
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function install(PackageInterface $package)
+    {
+        $extra = $package->getExtra();
+        if (empty($extra['class'])) {
+            throw new \UnexpectedValueException('Error while installing '.$target->getPrettyName().', composer-installer packages should have a class defined in their extra key to be usable.')
+        }
+
+        parent::install($package);
+        $this->registerInstaller($package);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function update(PackageInterface $initial, PackageInterface $target)
+    {
+        $extra = $target->getExtra();
+        if (empty($extra['class'])) {
+            throw new \UnexpectedValueException('Error while installing '.$target->getPrettyName().', composer-installer packages should have a class defined in their extra key to be usable.')
+        }
+
+        parent::update($initial, $target);
+        $this->registerInstaller($target);
+    }
+
+    private function registerInstaller(PackageInterface $package)
+    {
+        $downloadPath = $this->getInstallPath($package);
+
+        $class = $extra['class'];
+        if (class_exists($class, false)) {
+            $reflClass = new \ReflectionClass($class);
+            $code = file_get_contents($reflClass->getFileName());
+            $code = preg_replace('{^class (\S+)}mi', 'class $1_composer_tmp', $code);
+            eval($code);
+            $class .= '_composer_tmp';
+        } else {
+            $generator = new AutoloadGenerator;
+            $map = $generator->parseAutoloads(array($target, $downloadPath));
+            $generator->createLoader($map)->register();
+        }
+
+        $extra = $package->getExtra();
+        $installer = new $class($this->directory, $this->downloadManager, $this->repository);
+        $this->installationManager->addInstaller($installer);
+    }
+}
diff --git a/src/Composer/Installer/LibraryInstaller.php b/src/Composer/Installer/LibraryInstaller.php
index dc28a095d..898c4a6b9 100644
--- a/src/Composer/Installer/LibraryInstaller.php
+++ b/src/Composer/Installer/LibraryInstaller.php
@@ -25,9 +25,9 @@ use Composer\Package\PackageInterface;
  */
 class LibraryInstaller implements InstallerInterface
 {
-    private $directory;
-    private $downloadManager;
-    private $repository;
+    protected $directory;
+    protected $downloadManager;
+    protected $repository;
     private $type;
 
     /**