First, Trip It has no relation to Ship It! :) Seriously.
Trip It is a great web site that aggregates your travel itineraries. You can forward them (at plans@tripit.com) your Orbitz confirmation (or hotel reservation or car reservation, etc), and they'll automatically parse it, and put it in your account. They attribute itineraries based on the email account you send the notice from.
The first time I realized this has a "must have" service was a trip to Boston. Someone in Boston wanted to pick me up at the airport, but lost my flight information. While I was in the air, they called my wife, she logged into Trip It and pulled the info. She had my flight number, arrival time, etc.
Then I realized that Trip It also lets you add contacts and shows you 'near misses'. If you and a friend are in the same city, it'll notify you and you can see about scheduling dinner. I'm slowly adding friends and colleges to my contacts. No near misses yet, but I'm still hopeful.
They finally won me over completely when I sent them a format they didn't parse, and they took the time to add in support for an entirely new travel agency. Just based on one user!
They're still in beta, and free. If you do any travel, I highly recommend it. And if you're a friend of mine, add me as a contact. Maybe we'll share a meal in Milwaukee!