Start with the Comic Book Podcast wiki and

ADD:
The Official Aspen podcast
Tangent Comics
Less Then Live
Bitch Team Alpha: Girls Like Comics, Dammit
Bry-Fy Podcast
Women of Marvel podcast
Pages and Panels
Talking Valiant
From the Booth podcast
Sullivan & Garvey: This Could be Fub podcast
Superior Spider Talk: Ultimate Spin
Comics and History
One Comic