Ernie101 said:
Well technically, I think they all are unless you're paying for the services like Napster...
Peer-2-Peer clients aren't any more illegal than the common VCR.
Now what you do with them.....well that's a different story altogether.
(ie. copying a friend's DVD vs. taping a TV broadcast)
back on topic:
May I suggest that you search for torrents. I personally have never looked for anything as old as Muppet Show or classic Sesame St. But I see pretty much every (popular) current show posted in less than an hour after it originally aired. This is a godsend when my shows are preempted by sports, tornado watches, speeches, etc.