GTD suggests using anything that can manage lots of lists quickly. I'm currently using a Nokia N800 for managing my lists, and it works well. There's a basic

GTD suggests using anything that can manage lots of lists quickly. I'm currently using a Nokia N800 for managing my lists, and it works well. There's a basic To Do app that's easy to use. I'm upgrading to an N900 once it ships. I had tried using a physical paper notepad, but it kept getting stale. Lots of pages of half-crossed-out to-do items was annoying and not easy to sort through.