I've discussed before about crossing the boundaries between internet social network and the real world. Jook is another attempt at it.
Imagine last.fm in the metro, or at a station, complete with broadcasting, profiles and feedbacks. That's jook.
Jook itself is a protocol specification (I won't discuss security... for now) to be implemented by hardware vendors: the final product could be a small gadget to be connected to an IPod, Zune or similar device.
People with Jook can listen to what the other user is listening to, provide feedback, access profiles and so on. It is going to be a great tool for small bands, marketers (how long before the first ads, if it manages to reach the critical mass?) music lovers and, why not, researchers. Memes never had such a way to spread before.
How long before the first RealLife/SocialNetwork gateway gadget is produced?