Advocacy, Activism, and the Internet: Community Organization and Social Policy

Edited by Steven F. Hick and John G. McNutt
(with a chapter co-written by Group Jazz member Emily Reich)

Book's web page from Lyceum Books

Rules for Radicals : A Practical Primer for Realistic Radicals

Saul D. Alinsky (Vintage Books, 1989)

This is a book about organizing - community organizing, political organizing. It's full of insight about the dynamics of groups and how to make things happen. Lots of ideas that can be leveraged to build online communities, build support for change initiatives in organizations, and energize groups around a common purpose.