I have to admit one of the best bars I've been to in Chicago was a Steeler bar called Durkin's Tavern.

http://chicago.citysearch.com/profile/3677896

On Friday's they have all you can drink beer (And not just the usual bud, miller and coors but also stuff like Guinness) plus all you can eat pizza and wings for $15 (From 5pm-9pm). Probably the best happy hour in Chicago...