[quote name='jalu6']I would think that a fan that is getting its power from the 360 would only manage to create more heat.[/QUOTE]
USB is very low power, have you ever had a usb key overheat?
From what I hear, the USB fan is pretty quiet, and as far as heat dispersing out the back and that being a bad thing. When you blast cold air into a porous object, it really doesnt matter where it disperses, cause it desperses all over.
I think the fan is a good idea, and the fans I've had for the Xbox and the 1st PS1 were awesome.