If you're like me, you have a stack of unwanted CDs that you're not quite sure what to do with. Sure, you could donate them to Goodwill, where they'll just join the mounds of other donated discs collecting dust, but why not trade them in for music you'll actually want? Swapacd.com is an online community that lets you swap your old CDs with other music lovers. Find one you want and post ones you're willing to give away. It's that easy.