I just read about this in the Sierra Business Council Newsletter:
This is link to the USDA Definition of a Food Hub, with an excerpt from the material:
Here is a link to a WorldWatch, Nourishing the Planet, article on the state of five fisheries that are being managed sustainably, with an excerpt:
Traugher Groh and Steve McFadden have written a book titled "Farms of Tomorrow Revisited: Community Supported Farms--Farm Supported Communities." This book was recommended by our Kathryn MacRoberts. Here is an Amazon link and excerpt from the description: