no silent coolers for the 8800GTS yet. (i assume you mean the silent heat-pipe versions of cards, without the fan). the highest you can get is an 8600GTS. until the manufacturing process is refined and able to be more efficient and output less heat, there will not be able to be a silent version of the card.
I already own an 8800GTS but find it a tad too lous, especially for my HTPC Antec Fusion which I have in my living room, I was just wondering if there was a way to remove the standard cooler and get a more silent one?