Mouse Mats...
Apparently the RatPadz version is better, but nobody seems to keep them in stock, so I couldn't be arsed trawling the Internet or importing one.
This one is damned fine though. My mouse moves very smoothly across it, and in fact now the cable is hassle as it pulls it away when I let go of the wire pulls the mouse over the mat a bit!
Counter-Strike is a lot easier to play, especially when changing between multiple targets. This does not help my problem of getting confused when two people run at me and I shoot inbetween them...
Lovely things including no little "jittering" by the mouse randomly, as it can track better, and low resistance on the movement. Down side is it's not silent? The surface isn't smooth, it's got a rough effect, which means my mouse makes a noise as it slides... I'm sure I can cope.