Göbekli Tepe is a huge archaeological site in Eastern Turkey, currently under excavation (make sure you click on "Pictures"). It is one of the oldest architectural complexes in the world, possibly the oldest, and appears to be a religious complex. Even more surprisingly, the civilization that built it appears to have been one of hunters gatherers rather than city dwellers.
Given that current historical opinion holds the view that agriculture, food surplus and storage naturally developed more "specialised" workers (including priests), how does Göbekli Tepe change this opinion, if at all?
Edit: following the second link, you'll find a "Movie" button as well as the "Picture" button. Just thought you might be interested.