Not a whole town, but there's some new apartment/condo developments right over in Kirkland and Juanita are being designed around low traffic plans. Businesses on the ground floor of the buildings, and they're incorporating most of the convenience businesses that residents would normally drive to (post office, coffee, salon, dry cleaners, etc.) I haven't seen further plans for necessity businesses (grocery, medical, etc.) but it's certainly a good start. The buildings are all green-designed, as well; energy and water saver appliances, extra insulated walls and windows and such.