Yea, I too use TripIt a lot. It's kinda sad though because like only 4 of my friends/colleagues use it - so the networking part of it feels empty.

However, it's an amazing tool because it imports *most* of my flights I book from my email and puts the itinerary right into my tripit look.

I have the app as well, so I automatically carry all my flight/hotel/travel dates/numbers/references on my phone even in offline mode (provided everything is downloaded before you go). This has definitely helped me at customs once or twice in Europe where everything was laid out and ready to go.

Still I wish more people used it, it calculates (albeit wrongly I feel) all your travel miles so that's cool too.