The books just don't stop coming. I've found three more titles that may be worth reading in relation to online communities and the evolving notions around them: The Starfish and the Spider, Wikinomics, and The Wealth of Networks. (See my amazon list for link info).
The first book focuses more on the ideas of spreading organizational behavior from a top-down model to a non-centric or peer-networked model. This sounds like an interesting idea for organizations with many peers doing similar jobs (e.g., consulting), but I have yet to read it to understand how it works on a large scale operation.
Wikinomic's from Don Tapscott is likely a must read for me to learn more from this semi-socialogical study of wiki behavior.
The Wealth of Networks was on the list of best books of 2006 from the magazine Strategy+Business, alongside other books like The Long Tail (also on my amazon list). It takes a macroscopic look at peer-networking inside and outside organizations, and the impact of those relationships on a business.
Starfishes, spiders, oh my