Our enemies would have a field day. The Reform Party is basically an old-time circus freak show, and I mean no disrespect to circus freaks. It's not clear whether it would actually dilute efforts to influence the major parties. I believe that people interested in the new issues are growing, and we might find allies in unexpected places. For example, my southern baptist friends were not very happy with the long census form.
Letter writing to congress still works.
I have written to other representatives in the state if they happened to be the only one on a committee, or even representatives for other states. I don't think phone calls work quite as well, but I recall influencing an issue in this way. It was a niche issue, and I got some attention with a careful explanation. Their paper starts out blank every day, and I have yet to get one rejected doing it this way. If it's a technology issue, you might be the only one writing in on that topic, and thus more likely to get in print.