I saw this on another forum, and found it interesting.
http://www.autorefrigerants.com/co00033.htm
A friend of mine posed it (it's off of a local forum) and he swears by it. He has had it in his Camaro for 3 years, and it isn't driven all of that much. No problems there. It looked like a lot better alternative to freeze 12 and the like to me. I guess I have just watched too many of the videos showing cars blowing up from using freeze 12 to trust it.