Just a quick guide to the auction house. Devs if there is anything incorrect, please post any corrections.
1. You cannot cancel an item put up for auction if there is a bid on it.
2. You need to check the completed tab to see if something you put up has sold, and then select it and hit retrieve to get your gold, or the same is true to recover any item that you may have canceled.
3. It appears items put up for auction do not count towards your warehouse maximums.
4. No wait time on delivery, its instant.
5. There appears to be a bug, as some people have reported not being able to buyout something they have a high bid on. Not sure if this also extends to anyone else placing a buyout, but it was suggested that the item in question was bugged so it may only be in that instance. I know buyouts work fine, both as seller and buyer, normally.
Any other questions, feel free to ask