personal issue tracking!

So I've recently been thinking about managing personal TODO items. In the past, I've been way too ad-hoc about this: my tasks live in vague hopes, in scattered text files, notebooks, sheets of paper, and emails. Probably not good for focus. What I want is a consistent system outside my head. If it sounds like I'm in the middle of reading Getting Things Done, that's because I am.

I tried the new GMail Tasks thing. It's pretty slick, and it works on your phone, on iGoogle, and inside GMail, but I wanted to be able to sort and search and keep notes on particular items, so I may go with something more industrial-strength. Currently trying out the roundup issue tracking system.

Thoughts? How do you stay on top of stuff?