Who's On TV? [edlundart.com] compares the demographics of late night show guests with the general population numbers in the US for a large collection of popular shows, including the Late Show (David Letterman), The Daily Show (Jon Stewart), The Tonight Show (Jay Leno) and more.
In the left column, small colored bands show the race / ethnicity distribution of the white, hispanic, black and asian parts of the US population. The right side of each vertical graph highlights the distribution of all guests for each show, while hovering the mouse over the graphs reveals that more specifically of the first guests only. Another series of graphs focuses solely on the distribution between men and women.