Use this thing, the Suzukaze Air-Conditioned Seat Cushion. It keeps your rear cool, funk free, and is allegedly eco-friendly.
Using the sweat generated by your bum and a tiny bit of energy, this cushion has an internal fan that blows over 170 liters of air per minute to keep your nether-region cool. It is light weight, portable, and so efficient that even if used as much as 8 hours a day, you'd still only spend pennies per month on electricity.
Whatever happened to prevention being the best medicine? If this thing needs sweat to operate, then it only works after I've already got a problem. A huge problem. Mainly that my ass is a La Brea Tar Pit and no amount of fanning is gonna save the dinosaurs.
Keep Your Bum And The Earth Cool [ecogeek]
Thanks to Shawn, who probably sent this after he saw the stain I left in his car