The latest episode is about monolithic domes; what they are, what benefits they confer, and how to build them. It is centered around an extensive interview with David South, president and founder of the Monolithic Dome Institute. This technology is really cool, and it could save the future in many different ways if widely implimented.
And here is part two:
Be sure to check the Monolithic Dome Institute web site for lots of information about everything I've talked about here, and tons of great pictures and stories from the people who have chosen to build with the technology.