http://www.dosomething.org/
Do Something is an organization that helps you get involved in your community. As part of Do Something at your school, you and your friends identify the issues YOU care about and create community projects to turn your ideas into action
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http://takeaction.amnestyusa.org/
Here you'll find alerts on urgent human rights cases and pending legislation where your action can make a difference. You'll find the tools and information you need to protect human rights in the US and around the world.

http://www.heifer.org/
Heifer animals (and training in their care) offer hungry families around the world a way to feed themselves and become self-reliant. Children receive nutritious milk or eggs; families earn income for school, health care and better housing; communities go beyond meeting immediate needs to fulfilling dreams. Farmers learn sustainable, environmentally sound agricultural techniques.

http://www.volunteerinsaltlake.org/
The Volunteer Center serves an area housing more than 800,000 people from Farmington to the southern end of Salt Lake County, and from Park City to Tooele. We recruit volunteers and materials to serve the needs of more than 300 state, county and city agencies, and all of the non-profit agencies that serve these portions of Utah. The Volunteer Center also provides staff for the fast-growing Corporate Volunteer Council by bringing together corporate volunteers with agencies and causes that need their services.

http://www.secondharvest.org/
Through a network of over 200 food banks and food-rescue programs, America's Second Harvest provides emergency food assistance to more than 23 million hungry Americans each year, eight million of whom are children.