Conan did a spot at ILM/Lucasfilm this past May when he was in San Francisco for a week doing his show. If you haven't seen it, you should.
The video was up on Youtube for a little while, but was quickly yanked.
NBC has the video, but you have to pick the clip you want to watch (I can't link to a clip...grrrr).
Go here and select "Lucasfilm Part 1 (5/1/07)" and "Lucasfilm Part 2 (5/1/07)".