Wisconsin Fish Fries: (mostly Milwaukee area):
-Brown Bottle Pub (all-you-can eat) http://www.foodspot.com/brownbottlepub/
-Beer Belly's (near the airport)
-Klinger's East (On E. Locust between Humboldt and Fratney...ambience is close to nil, but great hand-cut fries, fresh battered fish & cheap prices. Skip the slaw)
-Jack Pandl's Original Whitefish Bay Inn (right off Lake Michigan - I used to work there...the fish fry is very good - potato pancakes made perfectly, great homemade slaw, lightly bread lake perch,,,the pies are made each day, too, and soups are great)
Hope these help!
here's a pretty good article about Milwaukee fish frys, too, FYI: http://www.onmilwaukee.com/dining/articles/fishfry.html