HardOCP has put up a newbie video card overclocking guide.

First off, what exactly is video card overclocking? Well, it is simply running a video card faster than the manufacturer's stated specifications, allowing it to move more data than it did previously. Basically, we "soup it up" a bit. Nifty, eh? It is possible, depending on the type of card, that you may see a nice performance increase from doing this - possibly even a 5% to 20% better frame rate in some of your favorite games. This in turn should allow a smoother-moving image on an older machine as well as to help you achieve a lightning-fast frame rate on a box built by a power user.

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