Anyone know what kind of cool spider is this? (Picture from lots of angles)

Found this at the Joyce Kilmer Old Growth Forest in North Carolina. About an inch long, very brightly colored, there are several pictures from different angles and in at least one of the shots you can see the underside of his abdomen:
http://www.flickr.com/photos/49301708@N0…

That is a Marbled Orb Weaver.

Very gorgeous spider. Nice photos!