I have started using a CD trading service that goes by the name of lala. Basically, you list all the CD's that you own, then you mark whether or not you want to trade them, then you list all the CD's that you want to have. The service takes over from there. When someone else requests a CD that you have marked to trade the website lets you know so you can agree to ship it or not. They send you cases and envelopes even! Anyway, I have really enjoyed the service thus far, and perhaps you will too. Try it out at lala.com.