Under the cateogry "useful uses of the internet", please list: Paperback Swap. You sign up, you list books you want to swap, then for each book you send out, you get to request on. You do have to pay to ship the books media mail, but then when you request, the person sending it pays the shipping, so no money ever changes hands... it's the only place to get books cheaper than half.com. Genius!
Click here to sign up... for free, of course.
In the interest of full disclosure, I do get credit if you follow the link and sign up... so.... feel free to do so, then tell everyone you know because the more people who list books, the more books I can read. Yey books!! =)