Probably most of my miles Outside the Perimeter are in the south Metro area (south Fulton, Fayette, and Coweta counties) because of several well designed "centuries" (hundred mile sport/recreational rides) in that area. Three or four hundred miles can put a pretty good dent in my yearly cycling averages.
But for practical purposes cycling conditions in Cobb County is of particular interest to me, since my fiance lives just over the bridge in south Cobb. I've recently stumbled on a blog which, although it hasn't been updated in awhile, has insights into the overall cycling environment in Cobb. It's the Bike Cobb blog If you're interested in cycling in Cobb you may want to browse through the articles.
Based on my first trip on the CCT, I've decided to try out the bus-mounted bike rack, probably on a trip on the number 30 (the most efficient public transit method of getting to my fiance's house is probably bike-train-bus-bike). I'll continue posting updates on my cycling and public transit experiences in Cobb as I have things to report.