Favorite Eclipse Plugins
The list of my favorite Eclipse plugins is not that long.
This is a no-brainer. I do ColdFusion all the time, and I use Eclipse. Of course CFEclipse is on my list. 
I am a revision control fanatic, so I have TortoiseSVN on my Windows machines and Subclipse on all Eclipse installations to connect to my Subversion repositories. It is so awesome to have Subversion functionality built into the IDE. In fact, it was this ability, even more so than the CFEclipse plugin, that finally tore me away from Dreamweaver in code view (yuck, did I really use to do that?).
Originally developed by the guys at Interakt (who were enveloped by Adobe because they were so awesome), this plugin provides awesome JavaScript insight.
The IDE itself is nice, but then lacking some features I need (like ColdFusion insight). Aptana is so cool, they even made it into an Eclipse plugin! First, it is a great editor for HTML, JavaScript, and XML. Secondly, it gives you an opportunity to abandon Eclipse’s project-oriented approach and edit files from any context: your local filesystem, an FTP connection, a network share!
Great for XML editing, specifically.
There are more plugins I use, but these are the must-haves.