Even as Yahoo loses execs by the dozens, they continue to hire new blood. Blaine Cook, the controversial (and some say very talented) former chief architect at Twitter, is now a rails developer at Yahoo. A source at Yahoo confirms the hire and says he’s working on the Fire Eagle project in Yahoo’s Brickhouse early stage product group, which is run by Chad Dickerson.

FireEagle, which we’ve described as a “Twitter for location” was first announced in November 2007 and is currently in private beta.

At the time he left Twitter Cook said he was “moving to the UK so that my partner can pursue her career.” Plans change, I guess.

Shortly after he left Twitter, Blaine joined the Gillmor Gang to talk about his experience there.