Sam, I am a member of beesource and very active on Beemaster.com, both very good sites.
AHBs were discovered officially, in Louisiana June of 05. Since then, there have been roughly a half dozen or so verifiable accounts (tested positive) AHB colonies in my home state.
Last season I had to deal with an extremely aggressive colony that is being tested now. Most of the bees I run across are feral Italians, pretty gentle. I remove on average 130-175 colonies a year from structures and only a small handful if that are unusually aggressive.
...JP