There's me and littlebigman. I live in Cobb I believe he's in Dekalb. Atlanta's pretty hilly especially in northwest suburbs. Streets are pretty crowded and the drivers are pretty aggressive at least in Cobb they are. Still we've got a pretty good cycling community here just not a lot of commuters. Check this out:
http://www.pathfoundation.org/index.cfm
http://cooleylawstudent.blogspot.com
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The few, the proud, the likely insane, Metro-Atlanta bicycle commuters.