This article is awesome. I had read it before but lost track of it. It was nice reading it again. Mike's code is a bliss to read, I don't know how to explain, it shows such a clear way of thinking... I believe one of the best ways to learn about dynamic language implementation this days is by reading his code and the things he writes when participating in discussion forums. He is the real deal.

For an example see: http://lambda-the-ultimate.org/node/3851 (he goes by MikePall - without spaces)