Start with the Comic Book podcast list and

ADD:

Truthful Comics Podcast
Making Comics the Four Star Way
Optic Blast
Optic Blast Book Club
The Chronicles of SAGA!
The Counter Culture Comic podcast
Mike and Pol Save the Universe
DC Radio
Matt and Cat Have Back Issues
Read's Nerdgasm
Astro Boys
Rockin' Comics
Rockin' Comics Encore
Justice Society Origins
Comics Tribune
Dave's Amazing World of Comics

The Following Have Faded or Closed Shop:

Checklist Comicast
Chosen Podcast
Coffee Time with Ringtail Cafe
Comic Couch
Comic Book Crossfire's Friendly Fire
Comicbook Bin
Comic Society of America
Curious league of Comic Book Geeks
Eat Sleep Comics
Extra Sequential podcast
Feedback Podcast
Funnybook Babylon
Geekin Out
Geeks with Mics
Graphic Novel Book Club
Invisible Jetcast
Journey into Mystery
Multiversity Comcs Presents
The Open Tomb
Master Comicast
Raynman Presents: Ask MODOK
The Sidekickcast: House of M
Stash My Comics: Chase Variant
Superman in the Bronze Age
TCJ Talkies
Thwipping Boys
Webcomic Reviews and Interviews
2 People Talking
New 52 Adventures of Superman