Calvin Trillin puts out a business idea for mobile and 2.0 developers at the end of his article on test-driving the self-parking Lexus. He jokes about an in car system that knows alternate side-of-the-street parking. Now that is a service I'd love if I ever upgrade my 18 year old Saab to one that not only has air-bags and a built-in navigation system. I'd improve it by having it refuse to start if the next day is  an obscure Holiday. It would be great as well if it could think ahead and alert me to look for a Tuesday spot if the following Tuesday is not in play.