I like this post; I'll try and give a shout out to the one's that I've been to over the last few years that I've enjoyed, as I sometimes travel a lot for work and like to take my cues when I can:
Atlanta (home) - Twain's, Mr. Cues II, The Independent, Marietta Billiard Club, The Pool Room in Duluth (now defunct)
Raleigh - Brass Tap & Billiards (love this room!)
West Palm Beach - Kelly's Billiards
Bismarck - Shooters Billiards
Cedar Falls/Waterloo - Break Room Billiards
Austin - Buffalo Billiards
Albuquerque/Rio Rancho - Slate Street Billiards
Las Vegas - Best Billiards LV, Cue Club
Los Angeles/Burbank - Fantasia Billiards
Honolulu - Hawaiian Brian's
Tri-Cities, WA - Sure Shot Billiards & Darts
Toronto, CA - New Times Square Billiards
NYC - Chelsea Billiards
Probably leaving something off, but oh well...
