I love this: Kottke found a Weblog that lists a ton of great old "Sesame Street" clips now on YouTube.
Some of them have been pulled already, for the obvious copyright violations. But plenty remain.
The Muppets take the subway!
The Ladybugs Picnic! They talked about the high price of furniture and rugs, and fire insurance for ladybugs...the ladybugs twelve, at the ladybugs' picnic.