Eclipse 3.0 :). Yes, it hurts when it crashes out (frequently) and does odd things - the other day, it was running and spontaneously vanished from the dock. I showed this to other people in the office to check I wasn’t imagining it. I’d never seen an app do that before :).
I’m hoping 3.1 will fare better, but haven’t had time to try it yet. Note that at work I have two or 3 machines on my desk - one OS X, one windows, and often one linux too - handy for testing. Sadly, whereas the two PC’s have 1Gb RAM each, the iBook only has 768, and 768 on OS X seems about the same as 400 on a PC (measured by: apps slow, plenty of swapping, plenty of out-of-memory crashes etc).
768 on the iBook is enough for Word to only crash once every week, with > 10 docs open most days, and Mozilla to never crash with > 5 windows with 5-20 tabs in each. So, good for a decent desktop replacement, just no good for development.
I’ve been testing some JME stuff (generates LOTS of garbage) on the 1Gb machines and it’s quite scary how quickly a small JME game running java 5 can take up > 500Mb RAM :). Runs much slower on the iBook 