Kashif Ali and I recently put together a video demonstrating some of the technology we've developed to enable extremely low-power GSM cellular infrastructure. That video is available here: www.youtube.com/watch?v=i8PElVGDe5M It's a very technical discussion, so you may be lost if you're not already involved in GSM/Wireless. We're thinking of producing a simpler video in the future.
We got a ton of assistance from Harvind Samra of Range Networks and Sylvain Munaut of Osmocom. Thanks for the help guys!
We're very interested in feedback on the idea/technology, so take a look and get back to us!