An old school book swap is a great way to spend an evening. Invite people to your home with instructions to bring a specific number of books they want to give away. Have dinner, snacks, cocktails, or whatever you'd like and let everyone trade books. The best part of this type of book swap, aside from the fun, is that you can hear first hand accounts of what each book was like, whether the reader liked it or didn't, etc. There are quite a few book swap websites, too. The most notable include Bookins, Book Crossing, and Paperback Swap. You can also trade other media, like DVDs, on some of the swap websites.