A few months ago I chatted to Liam Mulhall who was doing some Open Source marketing for his Blowfly beer. Now, (via Jake McKee) I see Vores Øl taking it further.

The recipe and the whole brand of Our Beer is published under a Creative Commons license, which basically means that anyone can use our recipe to brew the beer or to create a derivative of our recipe. You are free to earn money from Our Beer, but you have to publish the recipe under the same license (e.g. on your website or on our forum) and credit our work. You can use all our design and branding elements, and are free to change them at will provided you publish your changes under the same license ("Attribution & Share Alike").