The release of DOOM 3 will doubtlessly prompt a number of readers to go out and upgrade their graphics cards. I myself foolishly bought a Geforce 6800 on Visa. Shame on me. But what if you want to get the kind of performance that you need for Doom 3, but can't (or don't want to) shell out the money required for a 6800? Well, looks like the 6600 may be the answer for you.
A great review here, on the Geforce 6600 and 6600GT covers the quick and dirty about these mainstream, budget cards from Nvidia. Well worth a read!