0 Rock, a three-for-three Emmy winner as TV's finest comedy, finally returns tonight. It's puzzling that I get scores of questions about the most obscure TV series, some canceled years, ago, but I have not received a single inquiry about where 30 Rock has been. Then again, given the mediocre ratings, this probably shouldn't be that great a surprise. A widespread observation is that the stories are too inside TV to strike a chord with the masses. How then do you explain the enduring popularity of the likes of Entertainment Tonight and Access Hollywood? Tina Fey has ticked off some...