Central America
Assoc. Int. Volunteers in Costa Rica - http://www.volunteercostarica.net
Association of International Volunteers of Costa Rica, known locally in Costa Rica as AVIC, is a non-profit association.
Jungle Medic Missions - http://www.junglemedicmissions.org/
Christian missionary organization that provides free dental and medical care in Guatemala.
Live in Panama - http://www.liveinpanama.com/
Guide to living in Panama. Compiled by Christopher Howard, the site has ordering information as well as book contents.