A couple outliers, that are worth visiting while your in town, are Castle Danger (Two Harbors), Borealis Fermentery (Knife River), and the Thirsty Pagan (Superior, Wi).  Borealis does great Belgians, but I believe you can only visit during a brewery tour like the Duluth Experience.   Prepare to shell out $80/person for a brewery tour.  Upside is you don't have to drive and get shuttled around for 4 1/2 hours.  You can also get Borealis and Blacklist (super good, but not well known) beers on tap at various locations around town (check webpage for locations).  Pagan is a must for a couple pints and pizza.  Castle Danger's new taproom is spacious and super nice.  Lake Superior Brewing Company is great and close to Bent Paddle, as the previous poster mentioned.  The nitro pours at Bent Paddle are the best in town, imho.