Seems about time to take this off the IETF list with a bunch of action items for a design team interested in working on this under NOTE WELL:
* Should ping Nathaniel Bornstein who definitely has a dog in this fight even if it is only the satisfaction of being right (CCd)
* An ID looking towards being an informational RFC to specify a single dialect of Markdown, I think this has to describe what GitHub does because that is driving convergence.
* A second ID describing the mail discussion message format based on the informational.
* Code.
