Ah, once again, I think that we can do a more expansive job of recommending desserts in Wisconsin. This article can get us started...I'll add:
Ice Cream at the Memorial Union
Frozen Custard at Michaels
Anything at L'Etoile ;)
I once would have included a hot fudge sundae at Bosaki's but sadly that is no more.
Personally, I love the chocolate fondue strawberries at the Melting Pot :)
Ice cream from the Chocolate Shoppe in Madison...