I'm sure this is in response to http://sidestep.com/'s recent steal of some of Orbitz's market share. It allows users the ability to compare multiple sites prices (thus the deep linking) via their toolbar. Expedia, Orbitz, and travelocity all have deep ties and were founded by the same people who are now founding http://kayak.com/.
Slashdot Mirror
I'm sure this is in response to http://sidestep.com/'s recent steal of some of Orbitz's market share. It allows users the ability to compare multiple sites prices (thus the deep linking) via their toolbar. Expedia, Orbitz, and travelocity all have deep ties and were founded by the same people who are now founding http://kayak.com/.