I recommend donations through Lutheran World Relief, which is incredibly effective in its direct work and with partner agencies. Click the donate button. After a brief registration, you can donate by credit card and designate your donations to "Haiti Earthquake."
Almighty God, stretch out your hand to the nation of Haiti. Stir up your power, that your people may be moved to action in this time of disaster, and to aid in rebuilding from the long-term disaster of poverty and cruel oppression. Come, Lord Jesus, come.