I came across this recently although I've only had a chance to listen to a few of them. Mindwebs is a collection of 153 SF and speculative short story readings from a radio series that ran on WHA Radio in Madison, Wisconsin from the mid 70's until the mid 90's. The readings are further enhanced by sound FX, music and some guest voices and there is a heavy emphasis on one of my favourite periods of SF, the 60s New Wave, with readings of stories by PKD, Thomas Disch, Brian Aldiss, J.G. Ballard and Harlan Ellison, as well as stories from other giants of the genre such as Ray Bradbury, Arthur.C. Clarke, Robert Bloch and H.P. Lovecraft.
Well worth a listen if you are a fan of spoken word and/or classic speculative fiction.