So I made a movie in Final Cut Express and went to burn it in iDVD.
Two days later, four kernel panics, 100 failed burns, crashes, etc, iChat getting corrupted and crashing when sounds were played, I have done a Archived Install from the G5 discs, installing jaguar, then upgraded to panther, and now I can burn in iDVD just fine, iChat works, all is happy.
I have not reinstalled the MS MOuse Driver nor Keyspan yet, plus I have not moved in a lot of my library prefs, but the only thing that fixed iDVD was a reinstall from the G5 Jag disc. I tried everything, believe you me.