This was one of the best presentations of technical material related to markup that I've seen. Steve Smith's delivery was superb, his slides enhanced the talk and did not distract, his code examples were effective, clear, and technically polished. It was quite a complex presentation that was obviously well rehearsed and technically flawless. As a result, I learned quite a lot just listening, and will be able to immediately use some of what I've learned. I would highly recommend you attend one of Steve Smith's talks, if you have the opportunity.