I'm a .Net developer that has recently started working in the Java/GWT/Google Apps ecosystem, and honestly have found Eclipse Helios to be a perfectly good IDE. I can't honestly think of anything that it is missing - it has a unit test runner, "intellisense", easy dependency management etc.
Eclipse also has some neat plugins like eclimd that let you run genuine vim inside the IDE.
Eclipse also has some neat plugins like eclimd that let you run genuine vim inside the IDE.