Windows XPSP2, PPC 3.1, OSX Panther (from original install disks, not updated).
iChat (text only) seems to work for me; that is at 3AM I was able to start it (after getting networking going), add my .Mac acct, see my buddies and send a text message. I don't know if that message was actually received by my buddy because he was sleeping...
It appears that voice/video are a no go - though I expect that they would not be usable due to emulation speed, etc.



