Commuter Rail, Subway, and occationally the City Bus. And my own two feet.

I get a lot of reading done, and I get to laugh at all the people digging themselves out of snowbanks, complaining about the price of parking/gas/tolls, and the stress of driving in city traffic. (Unless they really do have no choice-- which is relatively rare in this area, but common in other parts of the US)

(Well, I'm not immune to the price of gas: it's one of the reasons for the proposed fare hike next year...)