Body Browser shows an interactive detailed 3D model of the human anatomy that includes multiple layers, such as the circulatory and nervous systems and the skeleton and muscles. It works like Google Maps, with special tools for viewing different types of body systems (nervous system, circulatory system, etc.), adding text, etc. You can send a link to any images you create by simply emailing the URL that currently shows in the browser address bar, as in this example:
It currently requires a browser with WebGL 3D graphics support (like the latest beta Chrome browser).