Check out this story in local paper. It does a great job with links to really useful trail maps and follows the pro racing Saturday and hugely popular Hub on Wheels Sunday ride.
If you haven't you really should do the Hub ride next year. You can do it any Sunday morning but it is a festival with guides, police at every intersectionadn plenty of fig newtons and bananas at rest stops.
Very very cool and a measure of real committment in improving bicycling. We are getting more lanes, signage adn awareness. I'm a big fan of Mayor Menino and Nichole Freedman's efforts.