A recent thread in the Expo bicycles forum reminded me of a project I ran across a while back. Don't think it's been posted here before.
A side-by-side tandem pedal/solar electric motorhome project:
http://www.atomiczombie.com/gallery/bradgraham/arcturus/arcturus.htm
A side-by-side tandem pedal/solar electric motorhome project:

http://www.atomiczombie.com/gallery/bradgraham/arcturus/arcturus.htm