This was a lot of places, but here is the Ars story:

Viacom joins Fox, ABC, CBS, and NBC in blocking Google TV for fear that users might choose to stream those shows over the Internet on-demand instead of watching them the old fashioned way. Google has been trying to assuage the fears of TV execs by insisting that cord-cutting isn’t a real phenomenon, but it apparently isn’t working. Media companies would rather milk traditional TV’s big ad dollars for as long as possible before accepting the less-big ad dollars that the Internet can provide.

This is going to be interesting to see how it eventually resolves. Will the web now diverge into “connected to too nice of a screen” or not camps?