I don't know how I got along without it – TripIt: Travel Planner Review

It makes it so easy to put in all the info for ground transport, lodging, flights, car rental, etc. Just forward email confirmations and it fills in all the rest. You can also put in photos of reservation confirmation emails or whatever. I don't use it for flight status or gate info, since people say it's inaccurate, but it's great for keeping all the info together, accessible on everybody's phones.
Review by Geneva S on TripIt: Travel Planner.