Happy Bike-to-Work Day! If bicycling is a feasible commuting option, the American League of Bicyclists encourages you to try it today.

I work from home on Fridays, so I won't be biking, but my husband Alex will ride his old hybrid the approximately 12 hilly miles from our home in Falls Church, Va., to Capitol Hill in Washington.

People can save big bucks in car-related expenses by driving less, according to a recent report by CEOs for Cities, a group of urban leaders that promotes city living. It finds New York City residents save $19 billion annually, because they drive less than people in any other major U.S. city.

If you're a beginner, the Sierra Club offers commuter tips. "Don't assume that the route you use in your car is the best one for biking," it says, encouraging people to get maps of bike trails in their area. "If you live in a city with a lot of hills, take them into consideration. Going a little out of your way might be worth it to keep away from monster climbs."