I don't know... there are also a lot of 'screencasts' coming out from developers. Personally I can't really stand them, for most of the reasons mentioned elsewhere in this thread. The only excuse for them that I could see would be that they'd be easier to put together than a well-written article with appropriate code clippings and images, but I'm skeptical of that.

Yes, and in the case of espn: you didn't think Joe Intosports likes to read (espicially at the evening, it's too much like work).

True enough :) Another big factor is that television / video by default are passive, in other words your brain is in a different mode than when you are reading. A person that is reading is far more likely to see an advertisement for what it is, an interruption of their day and a waste of bandwidth. Television / video consumers are more in the mood for wasting time and will pay attention to almost everything as long as it moves.