I'm in Miami, and although it's listed as being one of the cities T-Mobile has upgraded already it still isn't showing me anything but Edge. That sited Exiva posted only shows a couple of people noting anything in Florida, but I remember seeing some other places around the net where people had mentioned Miami had it. Oh well, I just wish I could tell that it was simply the lack of band and not some option I messed up.
Edit: It's Saturday and I saw 4g pop for me in Miami at two different locations. I'll mark it on that map when I get to a computer.