American Red Cross
Heart to Heart International
United Nations Foundation
Yele Haiti, founded by Wyclef Jean, sponsored by Rock the Vote
World Food Programme
AT&T Text Relief US: Text "HAITI" to 90999 to donate $10 via AT&T to the American Red Cross (Standard messaging rates apply)
Text Relief Canada: Salvation Army text donation of $5: Text "HAITI" to 45678
The State Department has set up a site with information on how to find American citizens in Haiti.