Eclipse lags behind in several areas, including enum (which seems to partially work) and varargs.
IDEA's support for J2SE 5.0 has been stellar for some time now. I haven't worked much with other IDEs recently. NetBeans, last I looked, had minimal support for 5.0; maybe that's improved. Someone mentioned that there were a few 'lesser' IDEs with 5.0 support (perhaps jEdit?).
I am using some future snapshot of eclipse 3.1 and I have no problems whatsoever.
Joined: May 14, 2003
Interesting. I believe I'm on 3.1M2, which is the latest stable build. I don't venture past the stable builds; they're bad enough with respect to performance. I take it you're grabbing integration builds?