The Corporation for National and Community Service's mission "is to improve lives, strengthen communities, and foster civic engagement through service and volunteering." Their programs include AmeriCorps, SeniorCorps, and Learn and Serve America. They also provide a wide variety of service-related resources online.

King Day of Service The Martin Luther King Jr. federal holiday has been designated by Congress as a national day of service with a goal of achieving Dr. King’s vision of a “Beloved Community.”
Volunteering in America Access volunteering trends, statistics, tools, resources, and information for the nation, U.S. regions, states, and major cities. You will also be able to see how states and cities rank on different factors related to volunteering.
National Service-Learning Clearinghouse Resources for those interested in strengthening schools and communities using service-learning techniques and methodologies.
National Service Resource Center Training and information resources for volunteer and service organizations.