MoCP now has their permanent collection online. Definitely worth a few hours of your time.
"Did you know that the MoCP has a permanent collection of nearly 10,000 photographs?
The entire collection is now viewable online, complete with images and information about many of the artists. You can browse by artist, search for particular works, and even save your own groupings after creating a user account!"
Visit the collection online now! http://collections.mocp.org