I started using bicycle as my primary way of transportation soon after I learned to ride at an advanced (hee-hee) age of 46. Not only to work and back, mind you: all of a sudden, everything was in easy reach! Chicago public transport is OK, but where it would take me an hour or more to get to but bus and or train (plus some walk), I'd be there in 15–20 minutes by bike. Whoa!
And then, I found yet another use for biking: local craft beer exploration (http://www.facebook.com/cbeeres). Me and a few friends, dedicated to both activities, like to visit breweries that popping up within and all around Chicago.
If nothing else, bikes and beer will, hopefully, save the U.S. economy!