What's a "premium" movie service these days without access on additional screens? Not much, which is probably why rumors indicate Showtime is about to follow EPIX HD and ESPN 3(no 60) by creating an online service for subscribers to view on their PCs and mobile devices. Don't expect to watch Weeds, Dexter and The Real L Word on your iPad just yet (except for what's already available on Netflix) as a spokeswoman had only a standard "nothing to announce to" offer Bloomberg Businessweek