JetBrains just announced the release of IntelliJ 9, which also comes with its new Community Edition! Congratulations, JetBrains!
The primary reason I was interested in Eclipse years past was because it was free and better than NetBeans; I could go from one job to another and not have to ask for an IntelliJ license. But I've always wanted to play with it. The final selling point to me was Eric Burke's IDE matrix. The day to start trying out IntelliJ has come now that a free version is available.
I'm playing with it tonight. Everything is familiar yet entirely foreign. I imagine that someone recovering from a stroke, learning to use his hands for the second time, might have similar (albeit more striking) frustration while realizing fingers don't magically go where they're supposed to.
My day job is providing tools and support to the Eclipse users at Google. We have quite a few Eclipse users at Google, but we also have quite a few IntelliJ users at Google. And it's not a terribly inaccurate characterization that the IntelliJ users at Google love IntelliJ. The folks that love it are colleagues I admire; Jetbrains must be doing something right.
If you use the Eclipse IDE to write your software, I encourage you to download IntelliJ and take it for a spin. See what you like, see what you don't. And then, report back. Sharing ideas from other communities can make a big difference to an open community.
Unless you fell into that "Tragedy of the Commons" conversation, in which case we're all screwed.