The Center for Association Leadership
Site for staff and officers of trade and professional associations, with many articles, sample forms, "cool tips," etc. Search under "volunteer" or "member development."
PTO Today Archives
Wide range of articles on recruitment, fundraising, and making things work, written for leaders of parent/teacher groups but applicable to any all-volunteer organization.
Self-Help Sourcebook Online
All sorts of information for running a self-help group, including links to existing groups and tips for effective online support.
United for Libraries Resources for Friends Groups
Free toolkits, promotional materials, and other resources -- including a :Pwer Guide to Successful Library Advocacy" for Friends groups of all types, sizes, and level of activity.
Volunteer Spot
Free site designed to enable anyone to quickly mobilize, coordinate , and schedule volunteers in their community, congregation and social network to accomplish projects more easily.