you could brew one yourself fairly easily
get your wort boiling, melt some quality couvuture(sp?) chocolate, add to the boil
in the bottling bucket, add some chocolate essence (double choc, see?)
I did that, made a batch of oatmeal stout, fairly neutral, added a melted Club choc bar to the boil, some choc spirit flavoring to the bottling bucket
was really nice, good smooth rich stout, with deelish choc taste
Then suddenly, no more choc!
will rebrew this, but use either some better quality choc, and more of it, and straight choc essence to the bottling bucket
There is a thread about it on the Oz "Craft"brewer list, fair has me rolling in stiches of laughter
Jovial Monk