It's Labor Day weekend and while the US Open Tennis Tournament starts tomorrow, we can't provide any other reasons to turn the TV on that day. Tonight, however, brings the return of Bill Maher to HBO, Sunday brings us "Mad Men" and Bill Burr's excellent special on Comedy Central, and Monday brings the premiere of Steven Bochco's "Raising the Bar" on TNT. Tonight 8:00pm The Grizzly Man Diaries Animal Planet - Series Premiere. 9:00pm Discovery......

Los Angeles-based comedian Bill Burr's excellent live show "Why Do I Do This?" makes it's TV debut on August 31st, Comedy Central at 11:00pm. You've had many opportunities to get familiar with Burr over the past 15 years, what with appearances on "Chappelle's Show", HBO's "One Night Stand", "The Late Show With David Letterman", his CD "Emotionally Unavailable", The Opie and Anthony Show, and his own XM Radio show "Uninformed". Not that Burr held anything......