A post by Simon Guest on getting Outlook 2007 configured for Getting Things Done has put me on to the David Allen methodology of the same name.
Using my doing it cheap methodology, I got the book for a few pounds from an amazon seller, and reading through it seems to resonate a lot with me. Appears to be a more developed version of what I try to do with email (when not overstretched) and is a lot more proactive than a todo list.
I like it, but must do it.