wtf, youre telling me i could just put an order in to buy 10000 BTC at $100 to make it seem like there was a huge demand for BTC without having a single cent in my account? that is the most stupid thing ever, I can't believe this has only just been changed.
Nope. It doesn't show on order book, just shows on your order list so it'll automatically get added when your funds arrive.
But still, I guess that the database must keep that unfilled order in mind, which would slow the system down.