I find it amazing that people take this idiotic idea seriously. Newsflash: there has always been protein shakes. Stuff you can buy at GNC is almost certainly a lot better for you than this garbage.
Protein shakes that I'm aware of aren't attempting to provide a complete and balanced diet, they are attempting to provide a supplement.
Some examples:
http://www.naturalhealthyconcepts.com/raw-meal-vanilla-GL2-p...
http://www.luckyvitamin.com/p-19447-ultimate-life-the-ultima...