None are NYC-specific, but they all take into account geographic region (mid-atlantic). They are listed below with a brief description.
Here's another carbon footprint calculator on SafeClimate.net, which appears to be run (or supported) by the World Resources Institute.
http://www.energyrace.com/ adds a social networking aspect (invite your friends! Watch your total community contribution!). Very thorough questions to.
http://www.earthlab.com/ adds a login ability and tracks usage over time. Very thorough questions too.
Good
The Nature.org calculator has the nicest interface providing interactive real-time updates based on your replies. Has pretty good follow-through to motivate action.
The EPA calculator is fairly thorough and has realtime feedback about what changes you could make and their effects. Good for motivating action!.
Buggy
The BP calculator is the most detailed regarding transportation and household energy consumption. However, it does not have 'steam' heat as a household heating option, which most of us in NYC use. But this is the only calculator that even gives options, even if not the right ones.
