The latest version of Firefox now supports nested quoting via q, meaning this renders correctly:
There was a pause. That being said, I do have a script for rendering quotes in Internet Explorer — it’s not really production quality yet, though.
This won’t work in IE, he said.
In other Gecko-related news, I discovered yesterday that those browsers have supported the now deprecated font-size-adjust for a while now. Hixie has a few test cases, and I’ll be posting a demo, probably tomorrow morning.