The Henry Project (Plantagenet genealogy)
I just now realized this project might have escaped the attention of some of our comm members. The Henry Project is an experiment in cooperative medieval genealogy, run by medieval genealogists Todd Farmerie and Stewart Baldwin. It aims to document all the ancestors of Henry II of England up to the tenth generation. For the most part, internet websites on medieval genealogy are pretty poor (with a couple notable exceptions) but this one is spectacular. Definitely worth checking out.