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.
I also love faxing because it lets me annotate stuff, like if I send a Letter to the Editor complaining about my senator, I print it out and scrawl "I am talking about you in public" or whatever before sending