As if the USB air conditioned shirt wasn't enough, sweaty Japanese peripheral makers felt the need to cool off their sweaty backsides as well. The USB butt cooler goes onto your chair, over the cushion, and flows "cool" air onto your arse via the onboard fan. There's an on/off switch on the cable, which plus into your USB port.
The only downside I can see is if you let one go, the air cooler will blow it up right into your face. Blech.
Product Page [Plusd.itmedia.co.jp via Everything USB]