In our monthly librarian meeting, one of the librarians mentioned that she was looking to buy some cross sectional anatomy books because the medical students are increasingly studying cross section anatomy. During that meeting another librarian mentioned the Interactive Atlas of Anatomy (http://www.e-anatomy.org/index.html) as good FREE image repository of cross sectional anatomy.

It has 1500+ slices from normal CT and MR exams covering the entire section anatomy of the human body. The site is free but requires registration.

Personally I always find it hard to find good images of "normal" anatomy. Everybody wants to publish and show pictures of the abnormalities. So if you are looking for another good medical image site, add this one to your list.