I actually had 2 snow iBooks (original 500MHz and the next revision which had a 600MHz processor). The 600MHz had the graphics problem, but the 500MHz model is still running to this day (knock on wood). Ended up parting out the 600MHz one.

Like Cory said, very, very early G3s (500MHz) or late iBook G4s. I have one of each (500MHz snow, and 1.42GHz 14" G4) both are great machines.