There has been a nasty auction house exploit doing the rounds today and I have held off posting about it assuming that it would be sorted pretty quickly. Last time I looked into this which was a few hours ago there was still a problem so I thought I had better bring this to your attention as TJP over at the AB confirmed it was still active quite recently.Blizzard shut down the original thread about this on the official boards pretty quickly this afternoon.
With some crafty HEX editing, some people have managed to mess with the auction house UI and system time to enable them to get hold of an item for the starting value and not the buyout value by switching the buttons around. Not having tested this myself, I am not quite sure if it has been fixed now, but it is real and it is a rather nasty exploit. I hope it’s sorted now because it has been doing the rounds for well over half a day.