If you don't need the diploma but want to get the education anyway here's a good way to do it...
http://www.cbsnews.com/stories/2007/01/04/business/main2330160.shtmlNo professor feedback and textbooks are still needed to make the most of this, but for people like me who just want to educate themselves this is a great way to do it.
If only you could enter their Rube Goldberg machine design contest, that would be a blast.