hmm, I'm up and running since the install, no problems yet and i have been pushing the system hard with work. I have PS, Flash, had GoLive open, Word was also open, the norm of Entourage, Safari, AIM, preview are running as always. So if there are problems, they haven't hit me yet.
I even made a special desktop as 10.3 draws closer.
http://www.urbansory.com/myDesktop.jpg
This is a downloadable version, although not the custom image i use on my G4
http://www.urbansory.com/vida.jpg