Interesting multi link on solar and energy efficient vehicles.
 

Just stumbled across this page, has heaps of links on everything from solar cars, electric bikes, boats and aero trucks:
Solar vehicles and efficient vehicles

Must be old and not updated very often; and quoted performance and other stats pretty dicey. Nonetheless, interesting as you say!

If I remember correctly it takes about $300 to $400 worth of solar equipment to support each mile you drive an electric vehicle with a grid tie system.
I think I will keep my diesel for now.