For cooling, be careful of some of the things out there. The Pelican fan stand is good, but it can only be used if the console is left vertical...not very practical if it's in an entertainment center. The Nyko Intercooler, OTOH, I'd stay away from. Because of the way it attaches to the console, it
can cause some problems. Using it will also void the warranty.
Overheating shouldn't be much of an issue for any new console at retail, as the older 90nm chips have been phased out of production and replaced with 65nm units, which of course run cooler. MS also redesigned the cooling system internally, so hopefully, the overheating is a thing of the past.