They are actually only selling their interns services over a three month period during the time they are not working on their main projects. The auction includes a "creative presentation" consisting of strategies, and recommended brand positioning and concepts. The winning bidder will not receive any finished advertising materials which I think makes this auction kind of lame. I'm kind of interested to see who wins the auction though and what the interns come up with.
Here is the link
Crispin's Interns on ebay