Start with the Comic Book podcast wiki and

ADD:
Gutters and Panels
Comical Podcast
Comic Nation
...Under the Comic Covers
End of the Universe Comics and Music
Hot Comics podcast
Resurrections: An Adam Warlock podcast
Comic Book Doggerel
The Three Panel Show
Escapist Comics Podcast
Hyper-Tanner Comics podcast
Comics Fondle
DC Comics News podcast
The Comic Bubble podcast
Frank and His Comics podcast
BSI Comics podcast
WNY Superior Comics podcast
The Comic Nation podcast
DC Radio podcast
Carol Corps podcast
Valiant Effort


These shows have faded:

Bailey's Batman Podcast
Batman to Oracle
Big Shiny Robot: Laser Brain
Bizarre Comicast
Cammy's Comic Corner
CartoonGal
Colossal Concerns
Comic Addiction: The Process 2.0
Comic Addiction: The Process Sensation Spectacular
Comic Booked
Comic Vine: The Invincibly Super Massive Comic Book Podcast of Stuff
Comics Cast
Comics Corner
Cupcakes and Comics
Danger Room: Giant Size Danger Room
Empire's Open
Fanboy Network: Fanboy Comics Interviews
First Comics News: The 80's Comic Book podcast
Flashfact.org: Comics Roundup
From Yellow to Red: A Daredevil podcast
Gavin and Ted Chatting Comics
Girls Don't Read Comics
Green Lantern's Light
iFanboy: Don't Miss
Krypton's Last Daughter
Nerd Girl's Eye View
No Related Items
The Open Tomb:Vault
Panel Pals Comics podcast
Pete's Basement
Pittsburgh Comics; Red Chair Dialogues
The Pull List
The Pull List: The Watch
Rack Pack
Randumb Idiocy
The [Real] Scratch Pad
Simple Enough podcast
STAPLE! podcast
Super Future Friends
HHWLOD: Carrol Chronicles
HHWLOD: Tales from the Attic
Word of the Nerd: Wayne's Comics
Word of the Nerd: Girls Gone Bad
WPR podcast: RLR