there was a rather large buy on bitstamp recently as well,
http://www.coinorama.net/#it took a chunk out of the ask walls.
I've also noticed that the bid walls are starting to solidify gradually on bitstamp now... including a larger than normal one at 120 forcing people to buy above it, and a decent size amount of bids around 100 that started to grow after the flash crash/big sale the other day
EDIT - can someone school me on what "chaikin money flow" measures?
EDIT 2 - so I googled... so yeah basically we know that the large asks at bitstamp stemmed from around the time of the dwolla incident and the loss of confidence in mtgox' ability to transfer money easily internationally. We also know that this ask wall is in part due to the fact if you want to cash out, bitstamps SEPA transfers and fees are quicker and cheaper.
This increased selling pressure is therefore totally understandable, but it seems to be gradually countered by increased bids... still massively outweighed by ask walls, but the ratio of money/coins on gox is still in gox favour.