If you are already familiar with installing Eclipse plugins, you can just use the update site URL below for your version of Eclipse.
Eclipse 3.7 (Indigo) gwt
http://dl.google.com/eclipse/plugin/3.7
Eclipse 3.6 (Helios)
http://dl.google.com/eclipse/plugin/3.6
Eclipse 3.5 (Galileo)
http://dl.google.com/eclipse/plugin/3.5
Subversion
http://subclipse.tigris.org/update_1.6.x
m2eclipse
http://m2eclipse.sonatype.org/sites/m2e/
m2eclipse-extras
http://m2eclipse.sonatype.org/sites/m2e-extras
-Dorg.osgi.service.http.port=8181
http://www.ops4j.org/pax/eclipse/update/