Something that goes hand-in-hand with living car-free or car-light is reducing the size of your personal day-to-day geographical world. I would define this as the geographical size of the area that you travel on a daily basis to go between home, work, the grocery store, and any other place you visit multiple times a week.
When my wife and I were looking for a new city to move to, we looked for a place that would allow us to keep our personal daily world small. Then we looked for neighborhoods that would put us as close as possible to our basic daily needs like work, grocery store, parks to enjoy, restaurants, etc. We also looked carefully at the bicycle routes available. Of course we started by looking at places and neighborhoods that we really wanted to live in, but then we narrowed the field further by doing our own walk/bike score. This was a process we were kind of already thinking through on our own when we discovered the Walkscore website. This website is walking oriented, but what's good for walking is usually good for biking as well: http://www.walkscore.com
Our new home in Bellingham, WA gets a 71% for walkability... I think that's lower than it should be, but maybe it has something to do with the hills? For biking our house is definitely a 90% or higher. I would give it a 100%, but you have to climb a monster hill... which at least keeps me in shape!
We are less than a half mile from just about anything we need (the historic shopping district of Fairhaven is just down the hill), and work for both of us is less than 4 miles away. The bike path that is a quarter-mile from our house can take us three miles to downtown in one direction (along the Bay), and about 7 miles out to a state park with a beach in the other direction. Bellingham also has plenty of bike lanes.
There is also a Drive Score tool at http://drivescore.fizber.com/ but this uses things like proximity to big box stores and malls (places I can do without), but I didn't find any tools that specifically score bike-friendliness. It would be more difficult to assess since these tools basically rely on proximity to businesses. For a real bike score you would need to factor in variables like traffic, available bike lanes, bicycle paths, etc.
Now I know there are people who live car-free even though they have to bike 20 miles or more to get to work and other businesses, but there sure is something nice about having everything you need within 5 miles or less. When we lived in Washington, DC our world was even smaller... but a lot more hectic with horrible air quality.There are some things we miss about living in DC, but overall we are very happy with our move... even if we did go from car-free in DC to car-light in Bellingham (it's nice to have a vehicle for driving to the mountains, and to the hardware store for those larger and heavier items).
And for anyone reading it... please don't take this post as saying that urban (or semi-urban) living is a better lifestyle than rural or suburban living. From experience I know many suburbs are poorly designed for walking and/or biking; but others are much better. And before my wife and I decided that we wanted to live right between the historic district and the downtown business district, we thought long and hard about moving to a more rural area. We just knew we'd hate the commute to our jobs downtown(even if we could do it by bicycle sometimes) and decided to save the rural life for a time when we figure out what kind of business we can do from home (if that ever happens). If we could figure that out, we might just move to one of the islands! There seem to be a lot of people in our area (mostly farmers, artists, writers, independent contractors and telecommuters) who live in rural areas but still manage a car-light lifestyle since they don't have to head into town very often... and might do that by bicycle or boat.
Simple and flawed as it is, the walkscore is an interesting tool for getting people to think more about where they live in relation to the places they need to be on a regular basis; and how that might affect their level of car-dependency and their quality of life. Everyone has their own priorities in the end, and I'm glad my wife and I agree on most of them. Unfortunately, high walk scores often mean high prices as well