Just finished doing a very brief test of the leaked drivers for windows XP. Not very impressed.
I uninstalled the drivers before hand like recommended. Put in the new drivers and start it up. Did a quick blast threw 3Dmark2001 and after it got done the text had like, a blue highlight over it. Started up Internet Explorer...this problem was present there also. My score had jumped 400 points (must have done a crappy install of the 3286 drivers, cuz now im within 100 points), but now this stupid highlighted problem. So I restarted and the problem was still present...weird.
Also, they have implemented some rotation settings under the ATI control panel...locked up the computer instantly, blue screen of death when I tried to rotate 90 degrees....dont ask me why I was doing this, just wanted to see what it did and I found out.
So I did a uninstall of the new drivers, went back to the 3286's and now im scoring 7840 regularly with a bunch of crap loaded up in the back ground. Im content for now, but as always would like to see drivers that release more features/improve speed.