Also: Flexcar (which is now Zipcar) is a sort of time-sharing car rental sort of thing that I know works really well in Boston and Portland (and other cities, too.) I have a number of friends who gave up their car (and the associated maintenance, insurance, and downtown parking costs, not to mention pollution) in favor of Flexcar. When you have a car in the garage, it's easy to take needless trips. Without a car in the garage, you walk/bike/bus more and save scheduling the car parked a few blocks over for larger-cargo trips.