If I have sound turned on, the game will crash every so often. Muting sound seems to stop the crash, and strangely it seems to be the battle sounds that cause it more than anything else (all crashes have been while I'm in battle).
Crash file generated by Apple's "Send To Apple" dialog attached - if you want some other kind of crashdump, let me know and I'll see what I can generate.
java version "1.5.0_16"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_16-b06-284)
Java HotSpot(TM) Client VM (build 1.5.0_16-133, mixed mode, sharing)