Who is guest hosting David Letterman tonight(explanation inside)?

[Mahaloth]

I missed the beginning AND CBS' webpage crashes my browser everytime I go there.

Who is he?

While we are at it, does anyone know who is hosting Thursday and Friday?

[Mr. Blue Sky]

Thursday & Friday will be repeats because of the un-ending nightmare that is college basketball.

[Alias]

The host would have been Luke Wilson. He's a movie actor.