I wonder if it'll let you convert things out of the box or if it was optimized for the way php is written at facebook. (eg. it doesn't support eval() but eval() is bad anyway)<p>Also, how hard would it be to do the same thing for Ruby and Perl? I'm sure there have been other attempts at compilers, but as noted elsewhere, having FB behind it makes HipHop more stable...<p>Oh, and atleast one thing from this anonymous interview came true: <a href="http://therumpus.net/2010/01/conversations-about-the-internet-5-anonymous-facebook-employee/?full=yes" rel="nofollow">http://therumpus.net/2010/01/conversations-about-the-interne...</a>