I find people's green remodel project notes intensely interesting and useful. Ally Ethan Zuckerman points us towards what has just become one of my faves: Hacking Your Way Off the Grid. In a power point presentation, Brian McConnell outlines the conversion he did, calculates the monetary pay-off, and draws some larger implications.
Especially as we work to get a Bright Green Living Wiki up and running, this stuff is downright inspiring.
You should also know about http://www.solarhouse.com/ which has been putting its solar performance data online for probably close to a decade now.
Also worth checking out http://www.homepower.com/