Alright, it's time you learned about podcasting. Here are three good ones to get you started:

The Jim Church School of Digital Underwater Photography has a weekly audio show hosted by Mike Mesgleski & Mike Haber, full of great underwater photography lessons:
Jim Church School of Photography Index Page

Bottom Time Radio presents a weekly audio show with some interesting interviews:
Bottom Time Radio

And just for fun, Dive Film presents a video podcast, with some great underwater footage:
Bottom Time Radio We Dive Deeper into Scuba