Installing plugins
Eclipse has a GUI for finding and installing new plugins which can be accessed
via Help->Software Updates->Find and install. However, I find it more
convenient to install plugins manually as described below.
First, download the plugin that you want to install. As mentioned earlier, there
are good online indexes available
here and
here.
If necessary, extract the plugin from its zipped/tarred form. Look for a
directory containing a file "plugin.xml". Copy this directory to the "plugins"
directory under your Eclipse installation, for example
C:\eclipse\eclipse-SDK-3.0.1-win32\eclipse\plugins.
Restart Eclipse and the plugin should be ready to use (sometimes the plugin will
provide a new view, editor, or perspective that you'll have to activate
manually).
If you're not sure if a plugin is loaded, select Help->About Eclipse
Platform, and click "Plug-in Details".

This will show a list of all loaded plugins:
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