Honourable Mention: Jeremy Paxman
I hear Jeremy can turn a good interview as well. But I will have to go with Charlie Rose. I first saw him interviewing p.t. anderson about Magnolia (and a little Boogie Nights), and it is still one of my favourite films.
See here for more details.
And a visual, not of Magnolia, but of Boogie Nights, which obviously has way more to offer in the visuals category....
