When my Ratzpad GS started showing signs of wear I started looking for a new mousepad and came across the C4 Mousemat on another forum.
http://www.cshyde.com/Excess%20Inv%20Sale.htm
This is seriously the coolest mousepad I've ever used. It's basically a paper thin sheet with an adhesive back that you can put on any surface. Not only does it look cool, it doesn't make an plastic-y scraping sound when you move around on it. I'd definetly recommend that to anyone using their desk for their mousepad. Just buy a sheet of this stuff and stick it on there.