It's hosted on Gumroad so that Mike can make money off of it (although you don't have to pay for episodes–you can enter in $0 and get them for free). Here's episode one, and episode two.

Blank Check is incredible–the run of Star Wars episodes were some of the funniest shows I listened to last year, in addition to being genuinely insightful discussions of film-making.

Jason Weiser's Myths and Legends has both similar set-up and similar subject matter.

There's a good chance you're thinking of Audio Smut, which became The Heart.