BeerMenus.com is exactly what it says to be: a database of beer menus for a variety of bars. Although it is only limited to NYC, Philadelphia, Chicago and Milwaukee, they seem interested in adding new cities in the future. You can browse the site by suburb or area, the most popular bars or most popular beers, or you can see what's new. And if there's a place that you really love that isn't shown, you can add it!
So for now, if you are in any of those four areas and want to know what kinds of beer to expect at a restaurant or bar, check this site out!