after seeing the new promo's for VMA featuring Russell Brand and Britney Spears - i've changed my mind about the American audience possibly not understanding his sense of humour - how could anyone not find him amusing? and after a bit of a search on youtube found this interview of Russell on the David Letterman show - where he obviously went down a storm with the studio audience.  have a look:

Russell Brand Interview with David Letterman

god he's funny, and a very attractive gentleman.