If we used something wiki-like that would probably work best. Not sure if the infrastructure @ccc has set up is good for that purpose, or if a Wikimedia-based site would be better.
As for me, I'm happy to put my shoulder to the wheel. I suspect to start with I'd just be proofreading and editing. But that's a valuable role, too. (I've spent a lot of happy weeks in Poughkeepsie, NY writing technical books (what we call Redbooks) and more time editing others'.)
I think I'd learn quite a bit in the process.
In other news I see Rocket have ported Python 2.7.x to z/OS so I might be absorbed with trying that on my home system. :-)