I am not usually a talk show kind of guy. While I get the appeal of Conan, Leno, and Letterman, I usually find the entire format a bit rigid and more than a little overly PR-ified (for lack of a better word). Celebrity comes on, promotes latest film/TV series/diet pill/exercise regimen, the host cracks a few jokes, and everyone is on their merry way. So it's a pleasure then to spend a Friday evening with The Kumars at No. 42 , a hybridization of the sitcom/talk show format, with some improvisational comedy thrown in for some extra spice. This series is unlike any talk show that I've ever seen, blending together the comic highs of the sitcom, with the interactivity of a talk show. Plus, the "Kumars" themselves are hilarious, portraying deliciously funny characters that instantly disarm the celebrity they're interviewing and usually wind up sending them into paroxysms of laughter. It's a novel conceit that has no real corollary here. (The closest thing I could t