Wow. Best thread evar. Sadly, I remember most of these shows (including Small Wonder, which I hate admitting I thought was funny.)
Two more:
http://www.youtube.com/watch?v=8-Y7oRa0hKU
http://www.youtube.com/watch?v=hZ8jGkKCsjs
I could do this for hours, digging up Facts of Life, Mr. Belvedere, etc.
It disturbs me that I remember so many of the lyrics, though; who can I see about purging my memory?