TV Guide Online has learned that Jim Belushi is joining the cast of Showtime's Hollywood satire Beggars and Choosers.... NBC has ordered six episodes of The Downer Channel, a half-hour sketch comedy/animation show being developed by Steve Martin, Variety reports.... O.J. Simpson is suing former lawyer Lawrence Schiller, claiming he shouldn't be allowed to use confidential information from his trial in an upcoming CBS miniseries, The Hollywood Reporter says. The CBS project is to be based on Schiller's book American Tragedy, which chronicles Simpson's trial for the murder of ex-wife Nicole Brown Simpson and her friend, Ron Goldman. —Michael Ausiello