http://www.emmytvlegends.org/interviews/people As mentioned in the stand-up comedy thread, I rented It's Bad for Ya, George Carlin's final HBO special, done after he'd turned 71 and a few months before he died. One of the bonuses is his 30-minute interview for the above-named archive. The Archive is mentioned and they said all these interviews are online, so I looked and they sure are. If the Carlin interview is any indication, a TV/ pop-culture buff could get lost in there for hours. One little nugget is that Carlin was a bit of a geek, an early-adopter of word-processing. He loved that he could re-arrange whole blocks of text, great for re-arranging what comics (at least today) call "chunks" within a set. Carlin deserves his own thread, but one great thing about this interview is that it's basically one of the great observational minds of the last half-century turning that lens on himself.
Hrmm, there is only a half hour's worth on the DVD I got. It looks like seven half-hour parts on the site itself, so there's a lot more.