HardOCP has performed some real world temperature and noise production tests of the GeForce GTX 480 and GeForce GTX 480 SLI, you can check it out over here.
The GTX 480 is hot. I know many enthusiasts are not going to be satisfied with a video card that idles at 73C (and even hotter in most SLI setups) and runs 93C under pretty much any kind of load. There have to be long term implications to this and I would just suggest that you buy from a board builder that has a rock solid warranty and a reputation for great customer service if Fermi is for you. These cards are hot and can very much raise the temperature in the room you are using your setup in. Maybe NVIDIA can bundle a coupon for a new ceiling fan?