In the past there have been threads about who are one's favorite comedians and even though I have always appreciated Marc Maron I didn't have him near the top of my own personal list. That being said I recently started to listen to his podcasts from his WTF website where he interviews other comedians and musicians from his garage and I cannot endorse it highly enough.
It isn't so much a 'joke telling' comedy show but a wildly honest and direct discussion among people with troubled pasts, severe drug addictions, deep-seated insecurities and hang-ups and flaws who happen to be truly entertaining and have absolutely terrific senses of humor.
It also has great insight into the actual business...or more accurately...the real world day to day 'life' of a working/coming up through the ranks comedian/musician.
It will not be for everybody...which I happen to view as a strength...but if you have any interest check it out.