I grew up without a car. My dh and I waited many years before buying one, which we could do largely because my in-laws, who live 45 minutes away by bus, have two cars and would lend us one if we needed it. We'd borrow it for vacations or lugging big stuff. My dh finally put his foot down and insisted we buy our own, since he as the only driver at that time was sick of fetching and delivering that car all the time... So now we have our own, but we try to use it as little as possible.
Our main idea is to not rely on it for daily use. That means commuting and all regular errands by bike or bus, and no regular daily or weekly activities that require a car per se. Which means for example that our son does not get to go to activities that demand being driven (by us, every time) - he did play football for quite a while, but we'd always carpool to games. We do have decent public transport here, but you have to be willing to spend a little more time to get where you want to go.
As I feared when we bought it, we do use the car more for "trivial" reasons that we need to. I have no qualms about using the car to go buy a sofa, how often do you need to do that anyway? But we find ourselves using it to go skiing in a different place than our local woods, just for varietys sake. And I use it quite a bit to transport my kayak, which is impossible to move otherwise. But we try to be strict about not using the car just to save 5 minutes and the hassle of waiting at the bus stop, for example for a spontaneous social call. Added bonus - we all get to drink wine for dinner 
In other words, we use our car for:
- necessary driving: lugging heavy or very large stuff, which can almost always be planned
- skiing or kayaking, occasional weekend trips, not on a regular basis
- vacations
and otherwise try to leave it be.
But I should add that we live close to public transport and the woods, precisely because we planned on daily life without a car.
Oh, I also wanted to add - part of the reason I no longer ride with a club is that they all meet up outside of Oslo, and drive cars there. That seems to me the ultimate insanity, to use a ton of car to transport my 120 pound self and a featherweight road bike, just so I can then go on a training ride using the most green mode of transport ever invented. And I just didn't have the time or fitness to ride the extra 40 minutes it would take me to get to the meetup point, and then back afterwards. So I'm back to just bike commuting, and doing my own haphazard training on the way.
Last edited by lph; 12-07-2010 at 10:49 PM.
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett