I have a strange one.
Back before Cryptsy locked all their wallets I transferred 29 Eth to them and everything was fine. However, now it seems that every time the balance of my eth address reached the 29 Eth threshold, 29 Eth is transferred to Cryptsy...
Does geth keep the last transfer command and automatically executes it if there is sufficient funds available? This is the only explanation I have for this as geth was not even running on my workstation when the transfer took place.
Needless to say I now have Eth stuck at Cryptsy