When I bought my first iphone, more than 1 year ago, there were a lot of interesting video podcast services, such as AdAge, FastCompany.tv, Scobleizer… That was an amazing way to stay informed while running on a tapis roulant, for example.
But with the end of the last year, I don't know why, most of them stopped to upload new iphone compliant videos. And this probably happened because, notwithstanding what official releases say, iphone/ipod users don't want to watch video on those devices.
But the ipad changes the story, again: with the ipad is really useful to have a group of interesting videos preloaded.
And the video podcast service become really a cool service.