html5 slides (from google) : No
Slides Presentation with HTML5: No
CSSS : Unusably slow on Chrome 18, pegs to 100% CPU
html5rocks: No. I can't actually get the presentation to view on my laptop at all.
Shower (mentioned in comments): Yes!
Hopefully some time we will get a nice shiny tool, which will allow easy simple animation, presentation tools, and resize to different projector sizes.
On another note, the actual blog post this is based on was terrible - just listing a bunch of tools, all of which are (in my opinion) terrible, was not particularly useful. However, I am now going to look at shower.
I want a presentation that looks nice when I am using a 640x480, and also looks nice when the projector is 1280x960. Can Impress.js do that?
Example presentation: http://gnab.github.com/remark/
Some of them can just easily be found by doing a simple search on github.