Who: Alcatraz head brewer Omar Castrellón, and assistant brewer Skip DuVall
What: Alcatraz Cherry Stout - A milk stout aged on 250lbs of cherries
When: Tapped 11/17/09, until supplies last
Why: You'd expect anything aged on 250lbs of cherry to be overpowering, but in this case you get all the normal full and tasty flavors of a milk stout with a sweet and subtle cherry finish.
Also worth noting: Alcatraz's 1 & 3/4 Belgian has been on tap for a while and may have benefited from the age - it's makes for a sweet and smooth easy drinking pint.