Civ3 and DAoC have caused the most problems for me in XP. I didn't get a chance to try DAoC this morning (an update was in progress) but Civ3 performs much better with the new drivers. Previously, I had to downgrade to 14.x or 15.x to get reasonable performance.
DAoC will be the real test - it was BSODing every time I exitted before.
I'm guessing it will take a bit before these are WHQL certified?