I use JBuilderX Enterprise (at work), JBuilderX Foundation and Eclipse 3.0.2. All excellent (IMO). I've always found the GUI creation tool in JBuilder to be pretty solid. Sure, it has it's temperamental moments, but I've done some very complex panels with it and it's 'done the biz'.
Tim
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"Your morbid fear of losing,
destroys the lives you're using." - Ozzy