I just picked up a PowerBook a week ago.
It comes with a lot of dev tools built-in.
For Java I have installed Eclipse 2.1 M5… I had to tweak some settings but it appears to be working now. A lot of people use IDEA or JBuilder.
I also installed JEdit which works well for a lot of things. Some people use it as an IDE with all the plugins.
Java 1.4.1 is still a developer preview release from Apple. But you can get it for free if you agree to the NDA. A 1.4.1 release on Mac shouldn’t be far off.
Overall I really like this machine. With BSD Unix under the hood it has great potential. Apple has a X windows server that will runonthe Mac desktop so there are lots of possibilities. Of course the Mac Aqua UI is much nicer than X windows, and the Swing port has a great implementation of the native Aqua UI.
This hasn’t become my base development machine yet… but it is just a matter of time before I have everything configured. I’m already using my Win XP box less and less.