Author John Grogan is steamed. The reason? Someone besides him is trying to cash in on the success of his sleeper bestseller Marley and Me, and that someone is his former employer the Philadelphia Inquirer. Publishers Marketplace reports that John's agent Laurie Abkemeier has sent a letter to sales reps complaining that Grogan wasn't given an appropriate amount of editorial control over the soon to be published collection of his P. I. columns, which the paper owns.