Here's an interesting product for your iPhone or Blackberry.
Congress In Your Pocket ( http://www.congressinyourpocket.com/about.cfm ) is indispensable.
The app contains every member of Congress, their staff, key phone numbers, committee assignments, etc.
It’s great for on the fly contact information for both members and staffers.
If you have an iPhone, Blackberry or other "smart phone" you might want to check it out.