1. Organize other people to do numbers 1-5. Make it very clear that you're an organizaed group, that you all vote, and that you know how to be heard.
2. Send a "handwritten" letter. Nothing else quite says- "this is important to me".
3. Overnight a printed letter, or fax it. It will generally be noted that you care enough to spend the few extra dollars.
4. Send a printed letter, regular mail.
5. Write an original e-mail message.
6. Forward an e-mail message to a member of Congress. Congressional e-mail addresses can be located at http://thomas.loc.gov.

-or-

Write to:

Senator___________
United States Senate
Washington DC 20510

Representative___________
United States House of Representatives
Washington DC 20515