iTunes 6 has full video support for music videos and television. An iTunes Music Store deal with ABC television lets you download shows - like Lost and Desperate Housewives - ad-free the day after they air for $1.99. Watch 'em on your new iPod or in iTunes on your computer. Finally! Somebody does pay-for, commercial-free downloadable television!
I am not sure how much I would want to watch videos on the move but being able to download TV to my Powerbook will be cool. I wonder what DRM is going to be built in to the video and what the different iTunes stores will do about making content available (we normally get shows like Desperate Housewives some time after they have been aired in the US).