http://code.google.com/intl/zh-CN/eclipse/docs/download.html
you are already familiar with installing Eclipse plugins, you can just use the update site URL below for your version of Eclipse.
Eclipse 3.6 (Helios)
http://dl.google.com/eclipse/plugin/3.6
Eclipse 3.5 (Galileo)
http://dl.google.com/eclipse/plugin/3.5
Eclipse 3.4 (Ganymede)
http://dl.google.com/eclipse/plugin/3.4
Eclipse 3.3 (Europa)
http://dl.google.com/eclipse/plugin/3.3
Detailed instructions for installation from update sites
If you are new to Eclipse, the following detailed installation instructions should be useful.
Google Plugin for Eclipse 3.6 (Helios).
Google Plugin for Eclipse 3.5 (Galileo).
Google Plugin for Eclipse 3.4 (Ganymede).
Google Plugin for Eclipse 3.3 (Europa).