My friend Clifford Meth recommends this charity—Kars4Kids—which turns your old car into summer camp time for needy kids. It sounds like a great cause and an easy way to support it. Just keep away from that jingle on the site’s front page, which will earworm you in seconds.
I donated one of my first post-college junkers to a charity like this back when I lived in Colorado. You get the tax write-off for the charity, and you don’t have to hassle with selling the thing and wondering if an irate buyer will come after you later when something breaks! (I actually had a brake line burst once while I was in the middle of negotiating the sale of a different car. He got an extra $50 off right there.)