Hey is this a good mousepad?
http://store.valvesoftware.com/productpages/accessories/product_HL2AMMousepad.html
http://store.valvesoftware.com/productpages/accessories/product_HL2AMMousepad.html
High quality mice have these really good feet that slide over anything (can't remember the name, it's at least 20 letters long) so a mousepad is unnecessary.
If you are going to get one, make sure it has one of the gel wrist supports, they are quite good.