Is anyone aware of a central source at the federal-level that itemizes out which Breweries are available in which states?
Not sure if it's what your asking for, but Someone posted this a week or 2 ago and it is a fantastic resource. http://www.seekabrew.com/distro/index.html
This is the best you're going to get. The whole three tier distribution system is quite confusing and pretty much regulated all at the state level.