It's easy to end an e-mail letter, but those aren't as effective as a personally written letter. In order of effectiveness, petitions are the lowest, followed by e-mail form letters, followed by personally written e-mails, followed by mailed form letters, followed by phone calls, followed by personally written mailed letters. Personally visiting your Congressman's office is also highly effective (this is probably less possible with your Senator, unless you live in a small population state, but Representatives often have offices that the public can easily visit and offer feedback). The most effective thing to do, if you don't have a lot of money (large cash donations are VERY effective), is to become a volunteer (assuming your Rep is someone that you can get behind on most issues and you'd like to see reelected) and get plugged in. It's not as difficult as you'd think. Once your Rep knows you by name, and potentially respects your opinion, you can slip some info in about tech issues from time to time. Of course, this does take a lot of effort and time commitment, which is why most people won't be doing it - but if you've got the time, and want to make a difference, it's definitely something you can do.