Start with the Comic Book Podcast wiki and

ADD:
In Country: Marverl Comics NAM
Super Hero Speak
Rymes with Geek: Comics Now Sound Off
Rhymes with Geek: Hall of Heroes
Comic Reflections vid
Superman & Batman
Comicsverse
Make It Then Tell Everybody
HHWLOD Network: The Action Lab Podcast
The Comic Shoot
Robin: Everyone Love the Drake Podcast
Comic Syndicate
Tuesday Night Movies: Tuesday Night Comics
The Weekly Villian 
Comic Relief Podcast
The Comic Shoot
Comic Soup
Comics Unchained
Girls Wih Issues
I Read Comic Books
Maybe I'll be Back: Tales from Artist Alley