I can't for the life of me remember who it was, but one of my readers (was it mmrules perhaps? Would make sense if it was) told me ages ago to check out Marc Maron's podcast WTF, in which he interviews fellow comedians. Everyone from Robin Williams to people you've never heard of.
"Sent ska syndaren vakna", as they say. I finally got my thumb out of my ass and checked it out, and now I'm hooked. Favorites so far include the two Louis CK episodes, the Judd Apatow ones, and everything with Patton Oswalt.
And of course this one: Zach Galifianakis interviewed on the set of Due Date. The best part of it? When Zach talks about the 14 year old girl who works on his farm whilst desperately (and unsuccessfully) trying to not sound creepy about it.
(mp3) Marc Marcon - Zach Galifianakis interview
Available on the WTF Podcast.