The Nu Project.

Passed along by Madeline a couple of years ago (thanks!).

From the homepage (NSFW link):

Thank you for being here. The Nu Project is a series of honest nudes of normal women from all over the world. The project began in 2005 and has stayed true to the original vision: no professional models, minimal makeup and no glamour. The focus of the project has been and continues to be the subjects and their personalities, spaces, insecurities and quirks.

To date, over 100 women across North and South America have participated in the project. Without their courage, confidence and trust, none of this would have been possible. We are so thankful for their willingness to open their homes to us.

They're always looking for women to participate: link.

To see the galleries (NSFW!), click here, here and here.