Leinenkugels, Capital Brewery, New Glarus, Summit, Berghoff, Sprecher, and Goose Island are all really good craft brews available in a good part of the upper midwest. Capital Brews are probably my favorite around, the brewery's like a block from my house, and they have an outdoor beergarden in the summer with live music and stuff. Their beer is amazing as well, they've won rediculous amounts of
awards for pretty much every one of their beers, including "America's #1 Rated Brewery" by the Beverage Testing Institute's World Beer Championships.
Red Hook, Rogue, Dogfish, and Smutty Nose are all good ones I've tried that might be available around the country if you've got a good liquor store in the area.