I come from a family of organizers (my dad and my brother), so I'm intimately familiar with just how much work good organizing is. I also have a lot of guilt about the fact I'm not one. As hard as writing can sometimes be, it's orders of magnitudes easier (not to mention confers a lot more recognition and praise) than the unglamorous job of calling through lists, finding suitable meeting places, negotiating personalities, motivating busy and harried volunteers, etc...
For that reason, I'm always reluctant to use my writing platform to urge other people to organize. It feels cheap and easy. But with that disclaimed out of the way, I have to echo what Josh Marshall says here.
If you want health care, then do something about it. We are now in the middle of a fight. Fights are good. Democracy is fundamentally about the non-violent resolution of conflict, and we've got conflict. There is a small but very mobilized constituency of people and interests that want to kill health care reform. They have the advantage of being on the attack, or tearing down and criticizing and expressing their outrage. The job of advocates of reform is trickier, but unless there is a mobilization and concerted organized attempt to push elected representatives in a progressive direction they will succumb to the braying and bullying of tea-baggers. Find out if your congressman is having a town hall, and go. Find others to go with you. Let them know you will punish them if they don't support real reform. Call their offices. Show up at their offices.