I've watched most of the Mill processor architecture talks so far. It's fun to learn about, even if it ends up being too hard to make into real hardware (they can't simulate it as a full system yet?!). If you haven't seen these talks, I'd start with the one about the belt (embedded below). If you haven't studied computer architecture (superscalar architecture, hazards) it will seem abstract. So much of the design is significant only when compared to the traditional approach. The newest talk is here.
(PS: If you want to learn this stuff, I recommend Computer Architecture: A Quantitative Approach by Hennessy & Patterson)