TripWatcher.com sends alerts for airfare changes on routes you choose. An offshoot of the popular booking site Hotwire.com, it gives you the lowest rates in real-time via e-mail, Twitter, or Facebook.
Pintrips.com “acts like a digital bulletin board” by letting users compare flights from multiple sources. Instead of opening multiple browser tabs for Orbitz.com, Delta.com, etc., view all fares on one page.
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