A program like this NEEDS to be portable, so I can carry my contacts, appointments,, etc. along w/ me

It IS portable. I installed it to "My Documents" and then copied the "LeaderTask" folder to my thumb drive and ran it on other computers, which allowed me to update my personal ToDo list at work, at my girlfriend's house, etc. I think the only thing that might be missing is registration of file types, that sort of thing. Not a problem.

So while this suggestion has the most votes, it's not necessary.