Nice read. I am sad to see how many readers did not know about the stuff Mozilla is pushing.

Open Type Font features is another one that deserves mention.

http://hacks.mozilla.org/2010/11/firefox-4-font-feature-support/

I suspect designers have an Apple bias that makes them overlook stuff not coming first in Safari.

A small nit:

-moz-any(section, article, aside, nav) h1

Should be:

-moz-any(section, article, aside, nav) -moz-any(section, article, aside, nav) h1

To be functionally equivalent to the other example.