Kayak is a constantly evolving travel search engine. It was started in 2004 by the co-founders of Orbitz, Travelocity and Expedia. The site aggregates information from other travel sites, consolidators, airlines, hotel chains and online travel agencies. It's a pretty cool, intuitive site and the search engine does some of the grunt work of sorting through the clutter.
I'd read in Budget Travel magazine that Kayak is going to allow: Search Sharing, where you can share your search results with others who might be traveling with you. Search Snooping, which allows you to enter your home airport and watch as the best fares other searchers are finding from that airport pop up in real time, and Search On The Go, Kayak's iPhone app which allows for searching when you're mobile.
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