It looks like someone is selling big at Mtgox right now.
Hmmm....10k sold 36 hours ago, and 6k just now.
The very interesting thing to me is the 18k purchased about 24 hours ago. Looks to me as though someone with money wants BTC also.
(In my immature understanding of things, I expect that prices ending up lower indicate a large block being unloaded and vice-versa.)