Here's a site with a very informative video on endometriosis. If you have dial up Internet, such as I, allow a few minutes for it to completely download. And...be sure to have the volume on.
http://www.endocenter.org/endoflash_56k.htm
Yes! Yes! That is my most favorite site...it is endless!!! So much info, and I've been doing some heavy research in the past week! It is the best I've found, too!