A REALLY GREAT BOOK ABOUT COHOUSING!
This covers all different kinds of "intentional communities" from cohousing to ecovillages to house-sharing. I have been following it very closely as the model in the formation of the Guanajuato cohousing community. It includes stories of success and failure, and, more importantly the WHYs. It's not just for someone who is trying to form a community, but has good advice for those LOOKING for one, too.
"Creating a Life Together: Practical Tools to Grow Ecovillages and Intentional Communities" by Diana Leafe Christian. You can download it free as a PDF or find it for sale on the web.
Another good read: "With a LIttle Help from our Friends: Creating Community as We Grow Older" by Beth Baker. It covers LOTS of possible options from cohousing to cooperatives, house-sharing to programs designed to assist those who decide to live alone, but with a neighborhood or apartment "network".
Lots of information out there, folks! Go get it!!