Seems that quite a lot of the volume on that address[1] is about 40% of the volume of the of the stuff going through MT Gox[2]. Might be a coincidence.

[1] https://blockchain.info/charts/received-per-day?timespan=180...

[2] http://bitcoincharts.com/charts/bitstampUSD#rg180ztgSzm1g10z...