For agents looking for information on the Alpharetta area, or buyers looking for representation by a well informed Agent in the Alpharetta community, check out Kevin Warmath at www.liveinalpharetta.com.
As custom builders, we find ourselves doing quite a bit of web research in the North Atlanta area where we focus our operations, and Kevin's site was so informative and well organized that I was a frequent visitor. We were so impressed with his web acumen we reached out to him to discuss how we might work together in jointly markteting luxury custom homes (See http://www.liveinalpharetta.com/blog/2008/07/25/build-a-custom-home-in-alpharetta/)
As a buyer, or an agent, I think you will find much of the critical info on schools, taxes, listings, etc on the targeted North Atlanta market is all contained in his site (and easy to find). His blog is quite informative and entertaining as well.