The CBC has put a bunch of clips online at Google Video that run anywhere from a minute to a half-hour in length. There's some great stuff on there: John Lennon in 1970, Norman Mailer & Marshall McLuhan from 1968, Muhammad Ali & George Chuvalo from 1964, a 1978 clip with David Letterman as well as the likes of Gilda Radner, Truman Capote, Gloria Steinhem, Sophia Loren, Iggy Pop, Scott Thompson & Don Cherry, Paul Anka, the McKenzie Brothers, Shania Twain, Leonard Cohen, the Rolling Stones, and more. One of them has Keanu Reeves covering a teddy bear convention in 1984!
The clips can be found here:
CBC RETROBe sure to check out groupie Cherry Vanilla hitting on Leon Redbone. There are also a variety of other CBC clips - news items, movie reviews, short films, etc.