I've been using Kayak.com to search for cheap flights for a while now and have thought that they're the best around since I started using them, as opposed to Orbitz, etc. Always the cheapest deals, for sure. I just now noticed their tech page and discovered that they run all their stuff on Linux, and that many of their devs use Ubuntu specifically.
http://www.kayak.com/help/tech.html
Not very important, but I thought you Ubuntu geeks might be interested.
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