Hey Jake,
My daytime job is in software development, and video tutorials are getting more and more popular. You may want to consider distributing via a website, a-la:
http://peepcode.com/
These guys will sell single-videos, or you can pre-pay for multiple and then pick & choose the ones you want, or wait for new ones to come out.
If my AOS goes out, I'm not going to sit and wait for a DVD to ship. But if I could hit your website and pay $10 to see it now, my credit card would leap out of my wallet.
-james