I gathered these, plus a few other files such as my interview with Gov. Jesse Ventura, in a Distribution CD called The 20-Year Free-Fall. The Samplers are now available as mp3 for the first time. I've added the links to the Shockwave Radio audio page. The direct links are:
Shockwave Sampler 1: an intro to Shockwave
Shockwave Sampler 2: more obscure references
Shockwave Sampler 3: The Time Traveler Cycle
Shockwave Sampler 4: movie parodies and more
Annotations for The 20-Year Free-Fall, listing all the bits in the Samplers and where they came from.
Full interview with Gov. Jesse Ventura, conducted 9/9/99 (Real Media, 17:37). Real Audio circa 1999; you might need to download the .ram and open that.