I made beer cupcakes on Saturday for my Brother's birthday.  They turned out way better than I thought.  I was expecting these to be more of a novelty baked good than a yummy-I-want-to-eat-them-all cupcake.
  
I got this recipe from 
Big City, Little Kitchen.  I accidentally left out a tablespoon of butter, kind of an oversight.  I don't know if it would have made a huge difference with or without that tablespoon, but the cupcakes where very thick and rich.  Very yummy.  
I did, however modify the frosting a little.  Instead of milk, I used Guinness!  It was really good.  Since the cupcakes tasted more like a rich chocolate cupcake and less like beer, I wanted to add a little of the beer flavor to it.  It worked.  These are great, not too sweet or heavy but perfect as little cupcakes.  I had to top them with chocolate jimmies to make them pretty.  Everyone loved them especially my brother.
Now that I think about it, I used Guinness Extra Stout instead of the regular draught.  I also don't know if this makes a difference either.  Next time I make them I'll use draught and let you know.

I'll be making these again soon for Karla-quake.