Even with winter just a few weeks away, we can't imagine ever needing a mouse with built-in heating (cooling, perhaps, but not heating). But if you're reading this from the coldest corner in Alaska, the Thanko USB optical mouse can keep your palms warm on those cold, windy nights. It has an 800dpi resolution (a gaming mouse it's not) and even lets you control the mouse's temperature. It'll set you back $25 bucks.
Thanko USB Optical Mouse with Warmer [via Far East Gizmos]