At AussieCon04 (which was awesome) I went to a great forum that had some really high up editors talking about what kind of covers sell books.
It was a fun little insight as to what the public will or wont buy. For example hooded characters were all the rage for fantasy books until recently, or black books with single objects on the front sold several metric tonnes of books thanks to a certain series.
I was looking around at covers for Snow Crash by Neal Stephenson, one of my top ten books, as I had found a rather interesting copy in a second hand book store. When I found this cover.

This cover really annoys me for one main reason. The main character, who is apparently portrayed in this cover, is supposed to be black. ....What the hell is this supposed to be? Will people not buy a book that has an African-American male on the front so they need to put some pasty rapper on instead?
Sad days.