I've been using Kayak Trips for several years and have continued to be impressed as they have improved there system repeatedly. Just set up Tripit (free) today. Looks very similar to Kayak, but Kayak is free with no ads on either their app or website, that's fantastic. Also, had an email from a travel agent for an upcoming family vacation and Kayak parsed this out and pulled out the hotel details automatically when I forwarded it on. Tripit could not do this and made it a "note." Last summer we had a flight delayed 6 hours and Kayak sent me a notice allowing us to avoid going to the airport and sitting for hours. I get updates on my phone from Kayak about gate changes or delays always in time to be of use, and it's all free. They have also launched free flight tracking on their mobile apps (I use IOS). Very very happy with Kayak.