Check out this aritcal at Geek.com. Its about a un-maned air wing that has been flying around in cercles powered by solar power and yes... a Macintosh.
http://www.geek.com/news/geeknews/2001aug/gee20010814007287.htm
http://www.geek.com/news/geeknews/2001aug/gee20010814007287.htm