About five minutes ago I found a really simple organising website called Now Do This (via Stumble Upon, which is also dead good). If you click "Edit" under the latest task, you can add or remove tasks, as well as putting them in order of importance. I also went to their blog and it's REALLY easy to add in tabs so you can have several lists on the go.
Plus you can have "Now Do This" open in a sidebar on my homepage, so it can sit there quietly all day. This is going to be SO useful, or I could simply add "Look at Pictures of Kittens" for every other task.
It's a win-win either way!