The concept of the Ning was unknown to me before will richardson spoke about them. Although I have alluded to them in my wiki I was intending to explore them later. However I cam accross this article on the wikipedia article about nings http://www.chartingstocks.net/2009/03/ning-exposed-tech-company-ning-scams-its-clients/ and now i am not so sure.
As I am in the Catholic sector we have strong links with community charities and I was considering setting up a ning for one of the groups and sharing my experience through the wiki. I will dig further.
Maybe send a twitter out?