Wow—I had to look The Pruitts up on wikipedia. I was actually around then, though really small, and I don’t remember it at all, though I remember Diller as an entertainment icon.
Checked out their theme song after seeing that it was by the same guy who did The Addams Family: http://www.youtube.com/watch?v=—fk7HzTipI. Not nearly as good as that, but a very similar opening to the theme song of Sesame Street—which premiered three years later.
LOL - I don’t remember the theme song but I always loved Phyllis Diller. One of a kind.