Yeah, I am pretty sure it's Deepbit's payout address. Also, the numbers are inflated because receiving back change is counted as a deposit.
ex.
receive 10 - 10 received
send 1, receive 9 change - 19 received
send 1, receive 8 change - 27 received
... and so on.
Thanks. That would explain why they had so many of the 'largest transactions' on Blockchain.info.