http://www.gog.com/
(Just thought I'd give a heads-up to people who might have missed it.) GOG.com is holding their annual winter sale right now (I believe it runs until Dec. 29), and most of the games are 50% off or more. There are also new bundle deals every day.
Go buy 3Dfx games on GOG and support nGlide. (Carmageddon 1 & 2, Wing Commander 4 & 5, Messiah, and I'm sure many more...)