The U.S. Department of State has posted information on their website on how to help victims of the typhoon in the Philippines. 

Also, the Department of State has activated the Typhoon Haiyan Response Call Center to handle inquiries about US citizens who may be present in the areas of the Philippines affected by Typhoon Haiyan/Yolanda. Please contact the Call Center at 888-407-4747 if calling from within the U.S., or 202-501-4444 if calling from any other location.

Please note, after a natural disaster that email scams and phishing emails begin to appear.  Please visit the U.S. Computer Emergency Readiness Team for additional information and ways to protect yourself.