Contribute to the Community
The following sites will help you get started

www.volunteermatch.org
Volunteer Match connects you with more than 22,000 non-profit and public sector organizations. It is committed to bringing volunteers and service organizations together on behalf of community needs nationwide. Volunteer Match can also create a personalized account for you, and any community service organization can reach many more volunteers as a Community Leader. It includes everything from Hugs for Homeless Animals and Citizens for Peace to the Sacramento Crisis Nursery and Midwest Athletes Against Childhood Cancer, Inc.

www.idealist.org
Idealist.org connects you with more than 30,000 non-profit and community organizations in 153 countries. You'll also find organizations that offer volunteer opportunities and information about volunteering specifically for people 18 and younger. If you're new to the world of volunteering, you might want to check out this volunteering guide before starting your search. You can find tons of information on getting your family and school involved in volunteering, too.

www.citycares.org
City Cares provides links to affiliates in 31 cities, including New York, Atlanta, San Diego, and Charlotte, North Carolina. City Cares affiliates, known as "Cares" or "Hands On" organizations, engage over 250,000 volunteers in direct service to their communities each year.

www.interaction.org
nterAction is the largest alliance of U.S.-based international development and humanitarian nongovernmental organizations. With more than 160 members operating in every developing country, they work to overcome poverty, exclusion and suffering by advancing social justice and basic dignity for all.
It lists how organizations respond to disasters, so you can contact the one of your choice to see how you can help.

www.serviceleader.org
Service Leader is a great site with everything you need to know about volunteering, including cyber service (the main requirements for virtual volunteering are Internet access, good writing and communication skills, and the ability to work unsupervised.) It is sponsored by the RGK for Philanthropy and Community Service at the Lyndon B. Johnson School of Public Affairs at the University of Texas in Austin.