I remember when you posted about your account getting hacked. What a pain!
Definitely let me know if you decide to write your own service! At this point, I like Planzo, but there is no address book feature there. But yes, I'll totally give you some input if you get the chance to do your own!
I'll check out RTM, but I'm not really looking for task lists...I have a notebook for that. Mainly because if I get on the computer to look up my task list, I get sidetracked. LOL