My favorite is Habitat For Humanity.
http://www.habitat.org/
You can give money of course, but you can give your time and talent, too. This past summer, my company sponsored Habitat For Humanity build project by allowing the employees to work a day on a house without any loss in pay. My team spent the day hanging guttering, moving new appliances into the kitchen, and scouring an old bathroom on a remodel job. (FUN STUFF!). Another of our work teams put siding on a new house.Habitat For Humanity wrote:What is Habitat for Humanity International?
Habitat for Humanity International is a nonprofit, ecumenical Christian housing ministry. HFHI seeks to eliminate poverty housing and homelessness from the world and to make decent shelter a matter of conscience and action.
Habitat invites people of all backgrounds, races and religions to build houses together in partnership with families in need.
Habitat has built more than 300,000 houses around the world, providing more than 1.5 million people in more than 3,000 communities with safe, decent, affordable shelter.