Since there is no Eclipse plugins topic i'll create one here :)
So what are usefull/handy plugins for Eclipse?
Here's a few that I use:
Fat Jar The Fat Jar Eclipse Plug-In is a Deployment-Tool which deploys an Eclipse java-project into one executable jar.
http://fjep.sourceforge.net/Jigloo CloudGarden's Jigloo GUI Builder is a plugin for the Eclipse Java IDE and WebSphere Studio, which allows you to build and manage both Swing and SWT GUI classes.
http://www.cloudgarden.com/jigloo/I needed to use this for a college course and i haven't used it a lot but if you know some java basics but don't know how to code a GUI this plugin may come in handy. (Although the auto generated code is a bit rubbish..)
If you use an Eclipse plugin that you would like to share, let us know!