Some related links:
An LA Times article, Who Runs Hollywood? C'Mon by Joel Stein who actually celebrates (to the point of gloating) the high levels of Jewish achievement in the entertainment industry.
A list of Jews in The American Media (From SimpleToRemember.com Judaism Online). Actually this one surprised me because I don't think I'd ever seen a list of names laid out like that. Did Rick Sanchez lie?
Mondoweiss: Do Jews Dominate in American Media? And So What If We Do? by Philip Weiss