One thing to note about written letters going to DC offices. Remember that all federal and congressional mail is first sent to an outside facility somewhere for screening and irradiation because of the 2001 anthrax scare. If you write to your Congresscritter at his or her DC office, then your letter will be delayed until it is cleared. The best way for written communications is to simply fax them your letter, for the most immediate effect.
Yep. Great point.