I've been reading up on SPDY today, and I noticed something interesting -
the spec at Mike Belshe's github repo has the extension ".xml".
So what, you say ? Given that it was rendered as the html output of the xml2rfc, I suspected there was XSLT in the game. And indeed, with one more search, I found the origin of this: Julian Reschke's work.
This is definitely very cool - it means you have to store one less format, and the results are immediately visible as you change the xml.
I will definitely give it a shot for the next draft to see if it lives up to my (inflated) expectations.