In Japan a new digital audio/video/data broadcasting service called 1seg started in April. This revolutionary service allows the user to watch TV anywhere using 1seg-enabled mobile devices, such as cell phones, MP3 players, handheld game consoles, and even laptops. I've heard that the picture quality is clear, and, unlike cell phones, it works in tall buildings.

In addition to its broadcasting capability, what is significant about 1seg is its potential to unify broadcasting and communication. It is possible to, for instance, display ads of items that are shown on TV. It blurs the line between TV (broadcasting) and the Internet (communication).

Here's a screenshot of Vodafone 905SH, which is popular in Japan.

In US, the mobile landscape is many years behind, unfortunately. We are only beginning to talk about the recent popularity of Smart Phones. Yes, there are services like MobiTV but they haven't been accepted widely by consumers yet.