If you're still using the stock fan then get this:
http://www.gainward.com/html/downloa.../expertool.htm
It make most fans almost silent in 2d so they don't piss you off when you're browsing. Can make a difference in 3d too as long as the card doesn't get too hot.
Made my 6600gt inaudible from a loud whine and 6800gt less like a power station but still a bit audible. Seems to work on any brand of nvidia card.
