I have been and will probably always be a David Letterman guy. They style and flavor of Dave's show matches perfectly with my sensibilities. But I have to say that Jimmy Fallon is a welcome breath of fresh air for The Tonight Show. One of the best bits Fallon' team did on his old show was when they'd edit clips of NBC News anchor Brian Williams to make him rap the lyrics to a song.

For the first week of the new Tonight Show they have out done themselves! Watch as Brian Williams is joined my MC Lester Holt and they drop some fresh science with the classic Rapper's Delight.