Lawrence Lessig, in Wired, writes about open source beer. "Free beer" is a product by a Copenhagen artists' collective (Superflex) whereby the recipe for the beer is open to the public and is licensed freely. A new recipe is released every six months based on customer feedback. OpenBusiness.cc has lots of other examples of open source products. If customers tinker with a company's product, the company can learn how to make he product better.

I wish I could tinker with the library's licensed information products...