There are a couple places listed under Athens. Not sure if there are listings elsewhere. Septem and a few others show up in otherwise ordinary bars there and on some of the islands. Santorini actually has a couple breweries that serve there and some other islands. I'd like more info, myself, but for starters, I can say that there are a few place listings on this site.
Thanks for that dude! I actually found a place in Athens called "The Local Pub" which served a variety of beer from Mikkeller, Anchor, Buxton and several Greek beers as well. I brought with me a few beers from the US and the owner was more than happy to hook me up with some great Greek bottles to try.
Thanks for the link. I'm headed to Crete next week and had assumed I'd be drinking cocktails/wine and cheap lager all week. Maybe not!
Just back from two weeks on Patmos, and am pleased to report some progress: Nissos widely available in restaurants and shops, plus some Septem (Porter, mostly, for some reason that I can't imagine) and Volkan -- blond, white, gray and black -- in various grocery stores. I wouldn't figure Patmos to be ahead of the curve on these things, so it bodes well for elsewhere...