Why we like it: This is a great site with lots of ideas for volunteering, plus links to non-profit organizations in your neighborhood.
Why we like it: This site helps people in developing countries develop drinking resources, sanitation facilites and health and hygiene education programs.
Why we like it: This New York City based organization has lists of community service work for your tween.
Why we like it: Help end the book famine in Africa. We particularly like the "Donate to a Project" option.