According to this article , Seattle seems to have a startling number of people getting to work by foot or bicycle.
One interesting city program to encourage people to get out of their cars is "One Less Car Challenge":Nearly 10 percent of work trips in Seattle are by bicycle or on foot, and in the city's "urban villages" that rises to 20 percent to 25 percent, says Peter Lagerwey, Seattle's bicycle and pedestrian coordinator.
The program encourages people to give up use of one car for one month, offering commuters tips on getting around by bus, bike or foot and also providing the free use of a Flexcar when needed.
Of the 86 people who signed up initially in the fall of 2003, 20 percent decided to give up a car and the rest have vowed to drive less, [David Allen, a Seattle transportation planner] said. "It proved people could do it," he said.