The answer might be too simple: Out there! In many discussions I hear the argument that there are no learning networks currently available which you can take to study or to do research. Maybe the notion of an institutionally controlled or offered learning network might not be reality yet, but if we take the many self-organized learning networks out there you could also argue that the concept of learning networks has just become reality through the widespread use of social software and that the theoretical ideas behind learning networks (self-organisation, emergence, problem-driven short time cooperation etc.) are their foundations as well. Maybe the following video might support my argument a little: 

 Merry Christmas and Happy 2009!