Visit USB Geek and you will find some cool USB toys for your desk.
I found this mouse pad and hand warmer and I love it! I got it in the mail yesterday. I had to try it out first thing this morning. I sit right next to a window and my right hand can become numb from the cold air. This was my solution. This thing plugs into any usb port and only reaches 42 degrees so you don't have to worry about burning yourself.
Here's to toasty hands!