This book has gotten some interest here locally at the lab and I thought it
might be of interest more widely (with a "strong recommend" for Andy).
http://www.amazon.com/Tiny-Publics-Sociological-Associations-Sociology/dp/0871544326/ref=ntt_at_ep_dpt_1
It is Gary Alan Fine's new book Tiny Publics and in it he argues for the
importance of paying attention to meso- level organization (and even seems
to argue that this is the most "consequential" level of social life - small
(tiny!) though it may be).
-greg