Sorry if it's been covered here before. Just wanted to pass on:

http://www.visiblebody.com/

DS is very (VERY) interested in human anatomy so I was looking for resources and found this. It is free (I was surprised actually). Web based and pretty thorough. Just requires an ActiveX control.

Looks like we're about to loose power so I'm going to send this off before I loose my work!

JB