Many want to assist the people of Haiti but are wary. Often when disasters happen scammers come out to take advantage of your good will. Good giving also means giving to organizations where the majority of money goes to those in need. I'm wary of "misuse of funds, cronyism, excessive expense accounts, secret consulting contracts." I do recommend one specific charity.
Catholic Relief Services (CRS) is an exceptional organization. After the US Military CRS has one of the most effective disaster response programs in the world. The average percentage spent by charities on admin and overhead is 12.4% according to MinistryWatch. The admin and overhead percentage of CRS is 2.3%. CRS seeks to help people in the developing world break the cycle of poverty through community based programs with the local population as the central participant. This ensures that projects are sustainable through local resources and community.