Stephen Colbert was on "The Late Show with David Letterman" last night--it was his first appearance since it was announced that he'll be taking over for Dave next year. 

Having just seen it may take-aways are:

1. We'll be just fine.  Just from 12 minutes on the show, it seems to me Colbert can pull off hosting the show while not being "in character."

2. He has a clear admiration for Dave, and knows the mantle he's about to inherit.

3.  If it totally tanks, he still got to do a Top 10 List in Letterman's presence and got a laugh.

Now, if you want to read "a professional" take...