This bizarre little mini-crash that happened today is the result of two events:

1) The 5k buy at Mtgox yesterday pushing the price to $148.9 and then creeping back to where it was before, $143.

2) The huge 2k ask wall that one or two creeps put up at Bitistamp around $131 for no good reason. Perhaps it was someone cashing out of Mtgox. Either way, it pushed all the prices down at Bitstamp even when Mtgox was steady at around $143-144.