I’m still looking for the idea stylus for my iPad–I like to draw, and it’s way easier with a pen than it is with a finger. At the moment, I’m using Adonit’s Jot and mostly liking it, although I’m still not sure whether it’s possible to build a truly great stylus that works with an iPad. (I want one with a feel exactly like that of a good hard, pointy pencil.)
Serenity Caldwell of Macworld has spent way more time with digital styluses than I have. Maybe more time than anyone has. Here’s her amazingly exhaustive review. (The Jot scores quite well.)