We’re still loving Paperback Swap. We’ve received almost 20 books now and setting up the wishlist means we get a steady stream without doing anything at all except send out books as they are requested as they notify us when books we want are posted in the system. It’s really a great site: pay for media mail postage to send out a book, get a credit when the book is recieved and then get any book you want for that credit! If you list nine books, they’ll give you 3 credits to start out (Full disclosure: if you click on our link, we get a credit if you register and list nine books)
Another great site I used recently is emusic. If you sign up, you get 25 legal mp3s for free. They have a good selection of music from independent and smaller label artists, I could have definitely found 500 songs I’d love to have without any trouble. I get nothing from emusic if you sign up, I’m just passing it along!