I'll write more about the Atlanta Teabagger's gathering later. I actually concentrated on photographing signs and crowd scenes, so my focus was away from the speaker's platform and on the crowds. As I'd guessed it was reasonably large, given Fox News's role in organizing the event (Hannity covered the Atlanta teabagging).
I'm not good at crowd estimates, but I'd say more than two thousand.
I took a bit over a hundred photos, and will put all of them in a publicly accessible location sometime over the next couple of days (I'm exhausted at the moment, which accounts for the lack of literary flourish and wit in the post).