Jan 2016 — this is now permanently live at http://commonmark.org/help
Esteban has generously contributed several rounds of feedback and bug fixes that @jgm and I have provided. Now it’s our turn to take over, fork the code, and make further improvements. So I have forked it at:
What I’m looking for is community feedback on the live tutorial
I’ll be making whatever copy and code changes are needed. So please, take a look, and let us know what you think can be improved or changed in advance of moving this to the commonmark.org domain as an “official” help, tutorial and reference page!