The truth about TV ratings, online viewing and sci-fi shows | Blastr It has some interesting info about ratings and how online viewing, DVRs and piracy fit into it all.
TV networks that want to make money off of their content don't make shows for freeloading pirates. It's frustrating, however, that TV networks haven't done more to master online advertising (which can be much more targeted to the user watching the video) and offer content through for-pay streaming or download services like the iTunes store.