Sounds like my needs are a little different from yours. I also use Flight Update (and I do like its integration with TripIt - forgot about that benefit of TripIt). But I'm not primarily concerned with flight status. I'm more concerned with the overall list of plans - flights, yes, but also hotels, rental cars, tours, dinner reservations, etc.

AppInTheAir looks good for strict flight info, but that's not my primary concern.