How is Britney Fare-ing?

I viewed the list of Web 2.0 award winners. Some of them we've tried already such as Flickr, Bloglines, YouTube, Rollyo, etc. One that I tried that was interest to me and perhaps patrons is 'Farecast'. This site allows you to search multiple travel sites to determine prices of flights, trends of pricing, and recommendations as far as buying now or waiting...