I realized quite some time ago that the only to-do list that really works with me is my email inbox. I keep telling people that they should stop calling me, leaving voicemails, sending snail mail (if they actually want me to do something that is, I'm not an asocial animal). Just send me an email!
That will last until someone creates something like a personal to-do Atom/RSS feed that I'll subscribe to in my newsreader. That day, I'll be doomed.