Yeah, the Portland, Oregon area is probably the only place in the US that is more concentrated with brewers in an area. Asheville may even have it beat, but the ones out there are better, IMO. There was a vote for Beer City USA and Asheville won one year. Of course it had ballet stuffing like Zimm's voting page.
Asheville is awesome though. A handful of those should not really be on the map, but it was possible at first we may hit a couple of those places. Also, New Belgium will be another large brewer added to the list before too long. So they just keep on growing. I need to get more restaurant options in there. I just hit the restaurants with great tap lists so far