Letterman, Conan and Jimmy Fallon all had nice tributes to him. Letterman had a few words, Conan showed some of his old bits with Carson and Fallon pointed out that his studio was Carson's old studio in the 60's.
Of course, who can't forget his appearances on TV's Bloopers and Practical Jokes in the 80's? Classic.
However, we'll never forget his final moment ever shown in any commercial: him embracing a golden toilet, uttering the words "goodbye, old friend" in a Cash4Gold ad.