I’ve recently started using MonkeyGTD with David Allen’s “Getting Things Done” system. While it is not as fluid as paper lists, it has a really slick interface, it’s available on and off line, and it forces you to be a little more formal with the system then a bunch of paper lists.
It is available as one of the default choices at TiddlySpot, a great site that will host several different types of Wikis. One of the really cool things is that it resides in the browser, so you can work online or off. You do need to remember to save it to the server when you are done.
If you are looking for a pretty cool tool for GTD, I would definitely take some time to checkout Monkey GTD which you can host on your own server if you want, or you can use at TiddlySpot.

[...] little while ago, I wrote about using MonkeyGTD at Tiddlyspot for Getting Things Done. I’d like to share a little more about how I use it for [...]