Just wanted to share that so far this year I've converted two colleagues to the world of commuter cycling. I'm also about 1 pay check away from converting another colleague to the joys of commuter cycling. Sadly they are all bus users so it isn't any less cars on the road but a good start all the same.
Given I work in a very small company (15 of us) I'd say that was a pretty hefty conversion rate. It probably helps that we are all environmentalists though :-).