This episode is just a link to two other articles on other peoples' podcasts:
Rain is sizzling bacon, cars are lions roaring: the art of sound in movies by Jordan Kinsner in the Guardian
(audio version here / text version here)
Written by Jordan Kisner and read by Christopher Ragland; Produced by Simon Barnard.
Sounds natural by 99 Percent Invisible.
(listen here)
Producer Emmett FitzGerald spoke with film producer Chris Palmer; Foley artist Richard Hinton and sound recordist Chris Watson.
If you want to listen to more, look at these interesting 99 Percent Invisible audio episodes
The Sound of the Artificial World
Cartoon Sound Effects
The Sizzle
Symphony of SirensAnd these practical guides:
Using music with the Kitchen Sisters
Sound design with Haley Shaw
The Parallel Worlds Resources page has many more links to sound design articles!