Cell TV, as the Washington Post (via Yahoo!) calls it, is ready to go live in the United States. It's the "the latest diversion that wireless carriers are marketing to mobile American". Sprint, Cingular Wireless and Verizon Wireless have started marketing mobile video in the last couple of months, hoping to reach a wide range of people looking for entertainment while on the move and to replicate the success Cell Tv is having in Japan and South Korea.
If you're interested in the topic, don't miss the article, it's pretty good.