I just went to a Beer Festival and there was a guy set up that is launching a cool new website called http://www.beermenus.com
and what the site does (or will be able to do) is for you to type in the beer you like to drink and it will tell you which bars/pubs in your city that sell that beer and whether or not it’s on tap or in a bottle. He demonstrated it right there and found me all the bars nearby that carry Old Speckled Hen. Very cool.
It sounds to me like it’s a brilliant idea for beer lovers but I think it’s only operational in NYC right now as he said he just quit his job three weeks ago to do this full-time.
Anyway, check it out it's pretty cool and I'm sure if you contact them they’ll catalog your city soon :-)