For those wishing to hear Darwin's On the Origin of Species read to them, here are two I enjoyed:
1) LibriVox - complete 6th London edition - each chapter usually read by a different volunteer (some sounding like radio personalities, others rather difficult to understand)
2) Richard Dawkins reads Origin
An abridged reading of the original edition. Dawkins, an Oxford zoologist who along with Steven Jay Gould were leaders of the two main camps in the 'Darwin Wars' over evolutionary interpretation of natural selection, is particularly famous for his book The Selfish Gene. He also has a rich & pleasing reading voice (to my ear).
(very) brief review of audiobook