Doctors Without Borders is a group that works in more than 70 countries around the world to provide medical care and aid to areas that are or have recently experienced disasters, conflicts, epidemics or areas that simply don't otherwise have healthcare.
The fieldwork is done by teams of volunteers- doctors, nurses, financial personnel, etc. A full list of those that are being recruited can be found by
clicking here They're having open houses to recruit new volunteers, both medical and non-medical, and they're coming up soon. The one in New York City is tomorrow, March 5th. For more details on open houses and locations and dates in your area, visit
http://www.doctorswithoutborders.org/volunteer/recruitment.cfm They also accept monatary donations:
http://www.doctorswithoutborders.org/donate/ For more information on the organization, visit
http://www.doctorswithoutborders.org/home.cfm