Quake 3, MOH, Serious Sam FE/SE, and many others are supported natively. Here's the complete list of native linux games.
I'll be brief about ATi drivers under linux. It sux, get nvidia!
I got Abit NF7-s rev 2(nforce 2) motherboard and it works out of box with slackware 9.1 linux. Can't say the same for other linux distros cause they failed to install silicon image raid controller.
5 win2k installations??
Get rid of that virus nest
then try slax distribution which runs from CD ROM