So far this year Harry Potter movies have aired a total of 33 34 times on cable nets ABC Family, Disney Channel, HBO and Cinemax with ABC Family claiming four out of the five most-watched telecasts.
Update: Note that the Nielsen list below goes through 7/10/09 and the Harry Potter Goblet of Fire on ABC Family on 7/12 drew 4.089 million.
via Nielsen Wire.
That same Nielsen Wire post has Harry Potter vs. Twilight numbers for books, soundtracks, box office and online buzz.