Kayak is a travel search site that went up in beta back in October, as Gary covered more here: New Travel Search: Take a Trip with Kayak. It officially left beta yesterday and announced (link to Word document press release) that it would do a cobranded travel search deal with USA Today. It already has a partnership to do the same for AOL. The company also launched a paid listings program for its results, as covered more in this ClickZ article: Kayak.com Launches Beta of Ad Bidding Engine. A self-serve system isn't up yet, but contact details on starting are here.
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