Hottest New EDUpunk Company?

Has anyone been following what I consider to be the hottest new EDUpunk company in our space: Flat World Knowledge?

In addition to making their e-texts free, they can be edited by faculty members, and students can sell their lecture notes to make some extra cash. Also, check out TextBookMedia, as they are knocking it out of the park as well. I'd love to hear your thoughts.

Incidentally, Jeff Shelstad at Flat World Knowledge was a speaker at the 2009 Education Industry Investment Forum in Phoenix.