With the growing popularity of MP3 players, iTunes, and other music downloading services, the audio CD market is quickly shrinking to nothing. But for the time being, most of us have CD players in our cars and stereos, and almost all of us have some CDs that we’re not planning to listen to ever again. That’s where lala.com comes in. It’s a social networking site which includes a tracking system for CD trading. List the CDs you’re willing to trade, and you’ll get a request when another users wants one of them. Send it out, and when they verify its arrival, you’ll receive a credit which gives you the opportunity to request an album that you want from another user. The cool part is that you can find users who like the same type of music and take a look at their collection to find new music that suits your taste.