Ta Da!

I'm constantly looking for the ideal Task List manager. I don't know about you but if I don't write things down they simply never get done, it's silly really that I can remember all sorts of obscure trivia but can't keep track of the things I have to do for work. Anyway I must have tried seven or eight different products and although they are all good they don't do exactly what I want, so I don't use them all the time, so I still wind up forgetting something. Anyway I am currently trialling a very simple web app from 37 Signals called Ta Da list. Simple is good, but as usual there are a couple of things I'd like to happen differently. I'll probably end up writing my own app at this rate but I'm interested, what, if anything do you use?