There are a few VGA coolers that you can buy for the GTX 285, but you might as well just rev up the fan speed and get the same results.
Water cooling is pretty great, but it is costly.
I have heard about this aftermarket cooler for the GTX 285: http://www.arctic-cooling.com/catalog/product_info.php?cPath=2_&mID=237
But I suggest that you turn up the fan speed and try that before getting a new cooler.
How about the fan wiring if you wanted to hook the GTX fan up to a controller? Say a NXZT Sentry LX? Is that possible or safe??? Does anyone know what each of the 4 BLACK wires are that come out of the GPU fan and which one would be the control lead?...... I opened the card (GTX 275) and was hoping to snag a lead to control fan speed via my new Sentry. I know this is old, but Tom said I can still post. =)