If you would like to make a donation to help the people of Haiti right now and you want to be sure that it is used appropriately, may I recommend Episcopal Relief and Development. Don't worry; they don't proselytize. This organization (which used to be called The Presiding Bishop's Fund for World Relief) has a long track record of excellent and focused work during disasters and other situations of great need.
Unlike organizations (such as the Red Cross) who are specifically focused on the emergency itself, ERD sticks around after the immediate disaster needs and helps the people rebuild.
Even if you can spare only $5 or $10, please do. As executive director of a non-profit organization myself, I am very aware of how small amounts add up. Your contribution will help!