I was delighted to hear that Christopher Guest, the writer-director behind the improvisational mockumentaries “Best in Show,” “Waiting for Guffman,” and “This is Spinal Tap,” will be creating a new series for HBO, and even more delighted when I read in the New York Times that it will star Chris O’Dowd of “Bridesmaids” and “Pirate Radio.”  Guest and Jim Piddock (the English-accented broadcaster who uneasily shares the microphone with Fred Willard in “Best in Show”) will write the series.  HBO says: “Having recently lost his job and girlfriend, Tom has a rather unsure sense of his own identity. But when he inherits a mysterious box of belongings from a great aunt that he never met, he starts investigating his family lineage and uncovers a whole world of unusual stories and characters and a growing sense of who he is and who his real family are.”  Sounds wonderful!