Human Anatomy Online is an interesting site that allows you to explore human anatomy. Here is the description at the site:
Begin your detailed tour by choosing a system from several available options, including Skeletal, Digestive, Muscular, Lymphatic, Nervous, Cardiovascular, Reproductive and more. Each system is broken down into further units. For example, under Skeletal System you’ll find front and back views, several views of the skull, the spine, joints, cross section of bone, hand, elbow, hip, knee, shoulder, ligaments, teeth and more. A detailed tutorial, animations and descriptions make this site a virtual anatomy class on your computer! (Java capable browser needed to view the site.)
They also offer some interesting animations and tutorials.