For your entertainment:
RetroCrush is presenting a list of the top 100 TV theme songs (mainly American TV). Numbers 100 through 20 have been posted already, and most entries in the list have links to websites about the shows. (Hat tip: Garfield Ridge via Ace.)
And that led me to this....
The official "Tonight Show with Johnny Carson" website has clips of Carson as Carnac and other great moments from his years as Tonight Show host.