ummm, the same thing is going on at bitstamp. slow and steady stream of 1 btc sells.
This is a steady stream of
buys. These trades aren't originated by sellers because the seller's orders are being hit all the time. Someone is accumulating a large holding and does not want to do the usual whale splash of ripping up the ask wall.
Those were buys on stamp, and sells on gox.
You can't see it now though as it seems to have stopped.
I wonder if someone is succesfully getting USD out of gox and is trying to arbitrage while minimising slippage. Or gox themselves are.
We'll see if it starts again.