Found

Ta-da List

A free web service from 37 Signals for you to make and manage checklists. It’s personal organization stripped of complication and methodological orthodoxy.

This site has been around for a while but it never crossed my path until namedropped by Daring Fireball’s John Gruber the other day. I’m already fond of it; I can add to-do items from whatever device (computer, phone, netbook) I’m on at the time and check them off from any other. It has a custom UI for the iPhone and possibly other mobile devices. It’s unrelated to 37 Signals’ other fine products, some of which I use, aside from the one-line ads for them in the computer browser version.

It does one thing and does it well.