There's three knife podcasts currently: The Modern Neanderthal podcast (hosted by Nick of The Modern Neanderthal, and two forum members Auston/Epicsnugglebunny and Richard/xMachiavelli) which is slightly more off the cuff and the Gear Geeks Live podcast (as of late hosted solely by Tony Sculimbrene of Everyday Commentary with a rotating guest host), which generally takes a very specific, sometimes more esoteric approach. There's also the Knife Journal podcast, which is hosted by some more senior members of the knife community and generally addresses knives I'm not super interested in, so I'm not a subscriber.
There used to be a few more, like the Knife Thursday podcast, but they've fallen by the wayside. I've considered starting one myself but I'm not sure a single host format would work so well.