I have been using http://www.bing.com/travel/ http://www.bing.com/travel/ (was Farecast before MS acquired it) for a while now and it has easily saved me a coup

I have been using http://www.bing.com/travel/ http://www.bing.com/travel/ (was Farecast before MS acquired it) for a while now and it has easily saved me a couple thousand dollars on airline tickets. Highly recommend it although yapta does look interesting.