RTM is a fabulous site. I love love love it. I have only been using it a couple of months and I am amazed by how much more productive I am. It has pretty much everything you would ever need to use to categorize/organize your tasks - due date, estimated time, priority, location, etc., etc. - but all in a way that is unobtrusive and simple. The things you don't use (e.g. I don't use "sharing" or locations) don't get in your way. It's so quick and easy to put stuff into, and so intuitive to use, that I no longer spend more time creating my list than actually completing the tasks on it. If you use GTD (Getting Things Done), there are several ways to coordinate them with each other.

Only complaint . . . no way to print out my to-do list on an index card so I can make it part of an HPDA. (yet)

I tried it but it didn't fit my list of requirements well... more info: HERE

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