What about getreceivedbyaccount? The reason I ask is that I'm looking for a way to track users balances, and be able to manually alter them. For example a user deposits 100 BTC, then wins 10 BTC from another player in the system, heis now able to withdraw 110 BTC. Will he get a negative balance on the client then? If so that's okay.

But now what if the player buys an item from the house, his balance will decrease. Now how does the house spend those coins without making it look like a player withdrew bitcoins (not touching anyone's account balance)