This Top Oatmeal Stout list is from America's Best and Top Ten and from the results of the 2009 US Open Beer Championship.
  
1. Anderson Valley Barney Flats Oatmeal Stout, Anderson Valley Brewing - California
2. Shipwrecked Stout, Maui Brewing - Hawaii
3. St-Ambroise Oatmeal Stout - McAuslan Brewing - Canada
4. Wolaver's Oatmeal Stout - Wolaver's Organic Ales - Vermont
5. Wild Goose Oatmeal Stout - Wild Goose Brewery - Maryland
6. Samuel Smith's Oatmeal Stout - Samuel Smith Old Brewery - England
7. The Poet - New Holland Brewing - Michigan
8. Schlafly Oatmeal Stout - Saint Louis Brewery - Missouri
9. Breckenridge Oatmeal Stout - Breckenridge Brewery - Colorado
10.  Alaskan Stout - Alaskan Brewing  - Alaska
  
Oatmeal Stout
Oatmeal stouts include oatmeal in their grist, resulting in a pleasant, full flavor and a smooth profile that is rich without being grainy. A roasted malt character which is caramel like and chocolate like should be evident — smooth and not bitter. Coffee like roasted barley and roasted malt aromas (chocolate and nut like) are prominent. Bitterness is moderate, not high. Hop flavor and aroma are optional but should not overpower the overall balance if present. This is a medium- to full-bodied beer, with minimal fruity esters. Diacetyl should be absent or at extremely low levels.
OG: 1.038-1.056 
FG: 1.008-1.020 
Alcohol by Weight: 3.0-4.8%
IBU: 20-40
Color SRM: 20+