This talk just came in through the TED Podcast and I thought it was immensely interesting. Bill Gross, the presenter, is the founder of Idealab (linked below) which seems to be a kind of high tech incubator company. It appears from Idealab's website that they spun up a company named Stirling Cycles, which was later sold to Infinia Technology (also linked below). This appears to be unrelated to Stirling Energy Systems who is building some kind of large installation in the Mojave desert.
The idea he talks about is an intelligently designed heat capturing system that feeds heat into a stirling engine to produce electricity.