I wrote a review of some of these if you are still undecided. They are should be active sometime on 10/12/08 at: coreymol's Profile
Leave feed back let me know what you think.
I was just going to post asking about the best ToDo app... Then I found this Right now I'm using DoBot ToDos, but it's very limited . I have used the Appigo To Do, which was pretty good, and one that I'm thinking about switching back to, Chores. Chores is less a todo app than a list creator, with limited functionality. But, it worked well for my limited needs. Sounds like Things is the way to go, though, from this.