These may have already been mentioned, but a few of my favorites are...
Pocket Informant Pro - Comprehensive personal information manager...calendar, tasks, contacts, notes (text and voice), much more. By far my most-used app. Syncs iPhone, iPad and desktop application.
Dropbox - Everything that's on my PC available to me everywhere.
Sportacular (Yahoo!) - Tracks my favorite sports teams/events, etc.
Tapatalk - Great way to follow and use multiple forums (like ToTV) on your iDevice.
Kindle - Have your kindle books with you on your iDevice.
Audibooks - Listen to a good book while you run or workout.
DrawRace 2 - I like lots of games and they keep coming and going. This is imho the best iDevice game. I can't stay away from it.
