Do you have books you've read and movies you've watched that are now collecting dust? Trade them in for new ones to you. This is a great green way to recycle books and DVDs. Two sister sites, www.paperbackswap.com and www.swapadvd.com allow you to easily do swaps with other users. For each item you swap you're given a credit to request one from another user. All you pay is postage. It is a great way to get new to you books and DVDs while getting credit for old ones you don't watch any more or have already read.