I ran CotSQ with my group of 5 players. Didn't need to do much on the conversion front to 3.5 (just check the feats and spells mostly) - it played great.
Had more trouble with the groups' tactic of daylighting everthing in sight (stones, spiders etc...), which got a bit dull.
Still all their anti-Drow geekery was for nothing when the undead started turning up...
Tee Hee
Halgabron