The Deliberate Agrarian posted a neat innovation in his June 2012 Blogazine: solar pyramids. They serve the same purpose as Leandre Poisson’s Solar Cones® but cost a lot less. They probably will adapt well to my Square Foot Garden.
The "garden clamp" system of underground storage he uses sounds interesting, too. I first read about garden clamps in Mother Earth News.
I'll definitely want to get a copy of The Planet Whizbang Garden Idea Book For Gardeners when it comes out next winter.