HipMunk: We like to think of HipMunk as the best looking travel spreadsheet we've ever seen. Once you search it allows you to search by price, duration, departure time, arrival time, and agony (a combination of price, duration, and number of stops).
cleartrip - online travel app
top 10 Travel Apps for the iPhone. nice :)
Travel app by Jakub Antalik
Travel App by uidynamics - Mobile app interface UI UX
We love TripIt for keeping track of all our travel details. It even gives you directions between meetings if you need them!