I have posted a link to a zip file of the slides, the code and media examples, and the captioned versions of the screen reader demos. Note that the captioned demos are in flash but the presentation contains a link to web versions. The slides are in PowerPoint and do have alt text and notes where needed to further describe any images and tables. There is also a pdf version of the slides.
The slides are also posted on slideshare.net: HTML5 Accessibility (http://www.slideshare.net/bgibson/html5-accessibility-38927945)