I often lose to bunker rush, like Idra did vs PJ on ESL.
Though not always.

When I was terran, my response was to usually skip tank, make 4 vultures and drop them on protoss base to abuse the lack of obs.

check a game of mTm- vs tcatseye in Luna.
http://reps.ru/replays.php?replay=comment&id=3656#
Unfortunately it wont dl. But maybe you can find it somewhere else.