Check out this great graphic from GOOD (see the full size image here). It shows the best, independent, craft breweries in each state as voted by the GOOD community. I know I have enjoyed Lagunitas from California, but I don't think I have tried any of the other states' beers. Have you tried any of the brews shown on the map?
p.s. I came across this image using stumbleupon.com, a very cool site for exploring the web if you haven't already tried it!