[Wilduck]

It's working, and it looks pretty nice. A couple comments though. There are a number of things that would make textbook swapping pretty difficult. I'd be interested in how you plan to address these issues.

1) Often times a given textbook will only be used at a university for a couple years before they update to the new edition. So, at least every couple years a group of users will still have to purchase expensive textbooks. Will they then want to lend them to people instead of reselling them?

2) Would the users register they're books and then hold on to them? What if they then decide to sell them back?

3) What would stop someone from "borrowing" a bunch of expensive books and then selling them?