Fred connected us to the age of pulps, when science fiction was still forming itself, and to the first decade of SF fandom. He had innumerable tales to tell, about those days, and about all the years in between.
I'd like to share a few links, in particular audio and video where you can hear Fred tell stories and converse with his colleagues.
Frederik Pohl reminisces at Windycon in 2012 (MP3), courtesy of Leigh Hanlon's Chicagoscope .
Fred and Jack Williamson discuss “The Art, Science and Combat of Collaboration”, a 1977 panel at Confusion, from The Time Traveler Show and the Science Fiction Oral History Association.
SFFaudio page rounding up audio of Fred's fiction.
Also from SFFaudio, a 1972 interview with Isaac Asimov and Fred Pohl together:
Part 1 (MP3). Part 2 (MP3).
Video of Fred's 2004 talk at the Library of Congress (Realplayer format).
Mentions of Fred in my own blog. "Eponymously Yours, W. Skeffington Higgins."
(Prose) interview with R. K. Troughton at Amazing Stories.
Edited to add: Another audio track by Fred Pohl exists, but as far as I know it's not available online. In 2002, celebrating Windycon XXIX, ISFiC Press created A Walk on the Windy Side, a compact disc containing comedy, songs, and stories.
On this CD, Fred reads his 1949 story for Planet Stories, "Let the Ants Try." It's a 28-minute track. Each person attending Windycon was given a copy, but no further copies were sold, so the album is rather scarce.*
On the theory that two nonagenarians are better than one, the StarShipSofa podcast interviewed Jack Vance and Fred Pohl together in 2010.
In the 1960s, Fred was also a regular guest on Long John Nebel's late-night radio talk show. Some tapes of this show are floating around the Net, but I can't lay hands just now on any episodes that may feature Fred.
* I'm on it too, performing Jeff Duntemann's filksong "Our Space Opera Goes Rolling Along." Maybe I should put it online somehow. The tune is public domain, and I could probably get Jeff's blessing.