I've gotten to that p;oint with my car. I used to be a sloth. It was a slow process. It's only gone 300 miles or so since July, since that was when I last filled it up.
One strategy is to find a map and draw a circle with a 1- or 2-mile radius, and find the trips in that circle and pick at least one to start turning over to the bicycle. Another is to have a "car free day" first Sunday of the month. http://www.car-lite.org/
http://www.friendsjournal.org/conten.../feature2.html
I stumbled onto this site about the time I got the Xtracycle and it quietly inspired me, though it's got a religion and politics in it:http://www.sojo.net/index.cfm?action..._enabled=false
We had a meeting last Thursday of some people who want to make things better for cycling, and we met with a lady who'd been part of a successful grass-roots movement to pass a smoke-free ordinance here. She talked about strategies and efforts to, essentially, change the culture by modifying people's defiition of "normal." Most people aren't going to *challenge* "normal" - but those people may just be susceptible to being convinced by what they see and heare that it's something different than they thought, and they won't challenge that either.