i posted my complaint of the same problem in another thread...

I'm running an iMac with 10.2 (will get 10.2.1 in a few minutes) everything's stock except for extra RAM. My machine's completely stable except for limewire. There are times when the latest version wont even load properly before my computer crashes.

It's quite frustrating and I've uninstalled it completely and I may try again now that I know about the ultrapeer thing.

I don't know about the sleep thing though, that seems to be a G4 thing (several G4s have the problem at work but none of the iMacs).

It's frustrating!
Cheers!