The new documentary Magic Trip: Ken Kesey's Search for a Kool Place gathers never before seen footage shot during the Merry Pranksters' LSD-fueled bus trip across America in 1964. Kesey, the author of One Flew Over the Cuckoo's Nest, was the ringleader. The bus was driven by Neal Cassady, who was the inspiration for the main character in Jack Kerouac's novel On the Road.
Interview with Kesey from 2009.
http://pd.npr.org/anon.npr-mp3/npr/fa/2011/08/20110812_fa_03.mp3?dl=1
And Tom Wolfe interview...
http://pd.npr.org/anon.npr-mp3/npr/fa/2011/08/20110812_fa_02.mp3?dl=1