Ppl are retweeting this and I just want to add that faxing is THE most annoying thing to do to your representatives. There are websites where you can fax for a small fee and those machines are LOUD and then at the very least they have to deal with all the print outs.
If you have a valid email address and phone number, Fax Zero lets you send ~5 free faxes a day and has a list of US representatives who have fax machines. www.FaxZero.com