Table of overall scores for different browsers: http://rakaz.nl/2010/03/the-html5-test.html
Edit: (Like this: http://en.wikipedia.org/wiki/Comparison_of_layout_engines_(H... in case its useful to anyone)
I agree on the fact that there should be some differentiation between current html5 and proposed, (and that this site is hilarious: http://isgeolocationpartofhtml5.com/), as well as some of the downfalls of scoring codec support that the author has mentioned, I think I like the out of 155 idea where chrome can go above it.