This is a handbook on how to run a well organized community online. Some sections cater specifically to open source software projects, while others are more generic and apply to any kind of group effort. Plenty of anecdotes and examples are sprinkled throughout the book, which makes it a reasonably light read.
The book follows the evolution of a community from idea through engaging people, setting up infrastructure, building buzz and handling conflicts. Jono has tried to cover the whole picture of what makes up a great community, whether personalities, technologies or skills.
Areas covered over the nearly 400 pages include infrastructure setup, communication techniques, buzz building, event running, conflict resolution, process establishment and project governance. In every chapter, Jono refers back to experiences from his career, both failures and successes.
If you are running a community of any size, I highly recommend reading this book. Not everything may apply to your community, but for there is a lot in here for everybody.