I know this is awfully irresponsible of me, but I vanished for sometime.... Anyway, I looked at my MtGox transactions and it seems like I contributed 5.16 BTC to this a long time ago

2013/04/25 22:35:42    Withdraw       5.16000000 BTC    38.63092080 BTC
Bitcoin withdraw to 1At75rKd6e8b7S7AAPzZ5V3kAzhkGYhnpU

Not sure whatever happened