bring your own beer stein deal, which is pretty sweet.
They also have a bigger selection of German beers than usual, like various Spatens, Paulaners and Hofbraus, if memory serves. The crowd wasn't too big yesterday, and I met a couple of German dudes who said the place was the closest they've seen to a beer garden in D.C. Apparently they were singing drinking songs as well, but I missed that part. Sehr gut!