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I ran into Yahoo's new beta site for travel....
FareChase - Searching the Internet for Travel!: "Search Here. Travel Everywhere.Whether you are looking for flights, hotels or rental cars, we search more than 50 internet travel websites so you can find the trip you want at the price you want. "
Also A9 is out of beta process that begun in April and now the site is capable of linking ur Amazon's searches history into this and gives you some cool interfaces to bookmark, search etc... take a look at it ...
A9.com