CBS Corporation’s Showtime Networks and Apple today announced that premium cable programming from Showtime, including recent Golden Globe nominees “Sleeper Cell” and “Weeds,” is now available on the iTunes Music Store. With the addition of Showtime, iTunes now offers more than 50 popular TV shows available for US$1.99 per episode for viewing on a computer or iPod. Apple also announced that the company has sold more than 12 million videos to-date.