For less than a year, Download Television (through iTunes, Google Video Store and other places) has emerged alongside traditional Broadcast Television. In effect, the lag between the pay per view programming and the free to air equivalent has fallen from 6 months (through DVD sales) to 6 or so hours. Now, the lag will turn 'negative.' This summer, NBC will offer new episodes of The Office on the web first. Presumably, they will then be broadcast on the regular season.
What this means is that television programs will have a 'versioning' structure similar to movies that start with pay per view before going to free to air broadcast. This is not surprising as high priced versions are usually offered prior to low priced ones -- with the key differentiator being delayed. The surprising thing is how long this has taken to happen with regard to television programming.