The HTML 5 Experiments
I spoke at Open Source Conference (OSCON) on using HTML 5 today. A kind audience member videoed the talk.
The 45 minute video, slides (with links to the demos) are all available (I'm linking to another Opera page in order to keep comments together).
I gave a longer version of the talk at Stanford University, in which I discussed accessibility of the HTML spec, and overlaps with WAI-ARIA. (Slides, .ODP 2MB.)