the chiming balls are relaxing if nothing else, so that helps you feel better when you're at your desk. My mother-in-law has one of these:
3M Ergonomic Computer Mouse
She says it's great because it mimics the natural resting state of your hand. It works well, you just need a big mousepad and don't expect to play Quake with the thing and be any good
__________________
Sage knows our mythic history, King Arthur's and Sir Caradoc's
She answers hard acrostics, has a pretty taste for paradox
She quotes in elegiacs all the crimes of Heliogabalus
In conics she can floor peculiarities parabolous
-C'hi