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This Week at Treehugger: Willie Nelson has a limited line of 41 pickups
and yep, they run on biodiesel, have soy-resin bodies, and pack 700 hp a piece; Hymotion rolls out plug-in hybrid conversion systems for the Prius and Escape hybrids; the Prius hacking mission takes another step forward with the integration of a Mac Mini into the car s touchscreen; and a look at some of the most efficient and deliciously ridiculous DIY cars the 70s and 80s had to offer.

[Treehugger's Perspective Shift roundup appears every Wednesday]