(response to Sylvia's August 21 (10:31 p.m.) post):
I participated in the Viral Professional Development seminar, and so I'm glad to see this session. Every organization has its informal networks (social and professional). It's not easy to quantify the learning that happens. Sometimes, learning shouldn't be/doesn't need to be quantified but it's helpful (if for no other reason than annual performance reviews) if there's some way to capture informal learning.
Sylvia, your comments and questions are helping me drill down and clarify my questions (if only for myself)….I don't have a clear vision of what a professional development collaborative would look like—and that's something I'd to understand and I'd like to know what it is about an organization that allows a PD collaborative to flourish.