Just so's you Boston bicyclist types know, you can quite comfortably ride in the large shoulder on Route 9 out to Newton; it's probably safest at higher-traffic times to take some of the offramps (so as to avoid swerving into traffic on overpasses), but you can cruise Boylston St. at a goodly clip for several miles. Great exercise too - those inclines give your legs and lungs a bit of a how's-your-father, particularly eastbound.
In other news: wow I could use a nap.