Races and Events 

Active is a great site to locate and register for cycling events.
Cycle North Georgia is home to the infamous 6 Gap Century and 3 Gap Fifty rides.
Georgia Multisports Productions is a mgmt. co. which hosts a series of triathlons.
Georgia Cup is a mgmt. co. which hosts running and cycling events.
Georgia Cycling is home to the Georgia Cycling Grand Prix.
Grant Park Criterium is home to a bike race in historic Grant Park.
TriFind is a great site to locate triathlon races throughout the US.

Forums

Beginner Triathlete is a triathlon focused forum with running and cycling too.
http://www.slowtwitch.com

Member Blogs

http://ourtimetochange.tumblr.com/
http://treadster.blogspot.com/
http://punchlifeintheface.tumblr.com/

Other Area Clubs

http://www.bikesbl.org/ 
http://www.ladiesonspokes.com/ 
http://www.maccattack.com/ 
http://www.southsidecycling.com/ 
http://www.sorba.org/