Haven't found anything myself, although I find that just pitching your own thoughts to groups like this works in the short-term... All the obvious searches (median/s, median system/s, etc) don't turn up anything of interest, either. I think I could assume that there's not any median-specific communities, then.

(and on an unrelated topic, I see many, many people around this multiplicity idea who I've ran into elsewhere - hooray for having more of a spine than I!)

If you do find such a community, tho', you wouldn't be the only one interested in it.

-L.