Your imagination is not playing tricks on you this week. That probably is British rapscallion Russell Brand you see on your TV screens. Brand's first Comedy Central hour special debuted Sunday night (re-airs this coming Friday, March 13), his memoir, My Booky Wook, arrives on American bookshelves Tuesday, and he has a live date March 12 in NYC at the Manhattan Center. All of which means even more of Brand on the promotional circuit (last week on Leno, tonight on Letterman, later this week on Fallon, plus other daytime talkers likely).