sorry 'bout that "last American Beer" comment, there are really a lot left if you wanna get into micro breweries...ie
Abita Purple Haze - Louisiana
Lost Coast (many varieties) - California
Rogue (even more varieties) - Somewhere in the midwest
etc etc...
Samuel Adams is just the most commonly known other than coors which is more like water than beer. We actually have a liquor store in my area that has 500+ kinds of beer from all over the world. I love the American Microbreweries. I bet there aren't too many people that have tried as much beer as I have. I used to work at a place called "yardhouse" that kept 150 different types on tap and yes, I have tried them all...From Monty Pythons Holy Ail to Delerium Tremens/Nocturnum to Sea Dog Blue Paw, etc...Anyone know of any really off beat beers they would recommend?