I have two gyration mice, one at work and one at home. I've tried a lot of different mice, trackpads, trackballs, etc. but the gyration is, to my mind, the best solution out there, bar none.

Why tie yourself to two dimensions, and contort yourself endlessly trying to sit in a position where you're comfortable and you can reach your mouse? The gyration lets you sit back comfortably, slouch, lie down, stand on yer head and control the cursor by waving in the air.

If I'm doing detail work, like creating illustrations, I tend to leave the mouse on the desk. But if I'm just surfing, reading email, or monitoring RSS the gyration is perfect. If you haven't tried one I highly recommend it.