Here are two GREAT and reputable charities with extremely low overhead expenses that have done unbelievable work in the past in poor countries like Haiti and now have dedicated donation requests specifically for the Haitian relief efforts:
FOOD FOR THE POOR (more than 96% of all donations go directly to programs that help the poor)
CATHOLIC RELIEF SERVICES (93% of all donations go directly to programs that help the poor)
Please donate (and pray!)