HipHop will completely invalidate your need for Xcache as you now have an executable instead of php. You can probably get away with nginx for static and proxy i

HipHop will completely invalidate your need for Xcache as you now have an executable instead of php. You can probably get away with nginx for static and proxy it to HipHop'd php for your php. But that's still overkill in most situations. The nginx for static and php-fpm (which runs php as a fcgi) will get you very very far. Wordpress.com for example uses a similar setup (with a hell of a lot of caching in between). Most of my apps aren't bound by php cpu time, I'd only use hiphop to play with personally. =)