http://www.sweex.com/producten.php?s...54&artikel=657
2 buttons, scroll wheel. Ultra basic optical mouse, uses PS/2, cost me like 3 pounds. I guess since I've never had any better, I don't really mind it at all. I might even say I like it. This is my first optical mouse, and I've had it for years. It still works perfectly too, and I don't get any of that "cursor jumping" I sometimes hear of people getting.
The surface I use it on is just the (varnished) bare top of my wooden desk. I had a mousepad for a while, but it works better just on the desk.
Cheap and cheeful. Beats cleaning my balls every few months =p
At my college, they use the mice
grawl linked, but I don't notice any difference between theirs and mine.
Jam it back in, in the dark.