I have been using TripIt for about a year now.

Absolutely fantastic -- especially with the large iPhone screen.

However, to be honest, I mostly used the paid FlightTrack application -- I think it was about $5. It synchs with TripIt (so I can import itineraries via email) but also gives me accurate, up-to-date gate and time information.

It has saved me at least twice when there crazy last minute gate changes. And you can enable push notification, which is nice.

The only complaint I have is that FlightTrack does not do cruises or car rentals -- otherwise it would be perfect! I'm now trying another one, TripDeck, from the same compay. This one alledgedly does cruises, car rentals, etc, and synchs with Tripit. BUt I gotta say: the interface is too confusing for me. FlightTrack still rules.

So, for now, I use the TripIt app (because it shows itinerary price), FlighTrack (because it gives me flightstatus), and TripDeck (because it does car rentals and cruises).

Just hoping it could all be merged...