have a great article
on the graphics cards of 2004 and how they compare to one another. With Doom III about to appear in the stores you might want to see how your card manages in comparison to others, whether its because you are considering a new purchase, or you want to gloat to your friends. Either way, there's plenty of benchmarks there for you to pour over.
As you will see from the article, performance varies not just from card to card, but from game to game too, so its useful to be able to look at the benchmarks for a particular game you might want to play.