There's the Brickskellar, a genuinely unpretentious place in the Dupont Circle area which has
hundreds beers available:
http://www.thebrickskeller.com/ . It is a straight bar in a mostly gay district. Lucky Bar, which is near the Big Hunt, is also casual.
In Georgetown we find ourselves more often than we'd like on the top level at Third Edition and Garrett's. They are probably preppier/cheesier than most places in Green Bay, but not necessarily so for DC. Old Glory is good for cheap blues and decent barbecue.
In the Capitol Hill area on the Senate side, Irish Times is always fun. Capitol Lounge on the House side is chill and laid back for the neighborhood and we go for wing night sometimes (10 cents a wing). Hawk & Dove is OK
Check out
www.ontaponline.com for specials.