I've been using Eclipse for a few years now and although I've always been a bit curious to try out NetBeans and IntelliJ IDEA, I've been pretty satisfied with it. I'm working with a client now who uses MyEclipse, a commercial package of plugins that runs on top of Eclipse, so I figured I'd give it a try. I installed MyEclipse 6 on top of Eclipse 3.3 (Callisto) and was pretty happy with it, until I tried typing Ctrl-Shift-T, Eclipse's handy shortcut for opening the VERY useful Open Type dialog, and it didn't work. Ack! I use that dialog dozens of times a day! I searched around on the Web to see if anyone else was having the same problem and it turned out several people had, but hadn't discovered a solution. Well, I just happened upon the fix. I'll post the steps here, but I'll also try to track down some of those posts of desperate people on forums and let them know about it.
For some hard to fathom reason, installing MyEclipse must deactivate the Open Type command for the Java Perspective. To re-enable it, making it work with Ctrl-Shift-T and appear in the Navigate menu, go to Window-->Customize Perspective..., choose the "Commands" tab and check the "Java Navigation" checkbox. Taa Daa!