iPod-powered gloves
Ok, so they aren't exactly iPod-powered, but you can insert an iPod to keep your hand warm. Sean at Sean's Soapbox has made a knitting pattern available in PDF format for making these cool gloves. Just insert your iPod (it does fit all the way inside the pocket) and go. That spinning hard drive should keep you hand nice and warm...just move it from left to right on occasion.
If you're really feeling inspired, you can also try the knit cap that accommodates your headphone cables. Cool stuff.
[Via MacMerc]