Here is some useful stuff to help prepare your next awesome Python talk.
http://slides.html5rocks.com/ - slides using latest HTML5 technologies
Not in Python, but a good stuff anyway:
http://bartaz.github.com/impress.js - Prezi clone in CSS3
http://lab.hakim.se/reveal-js/ (it looks like https://github.com/ipython/nbconvert is able to convert IPython notebooks into this format)
Generators in Python from text formats:
https://github.com/adamzap/landslide - converts markdown, ReST, or textile to Google's html5slides template
https://github.com/regebro/hovercraft - converts ReST into impress.js presentations