I mean the really, really small screen: your cell phone. On Friday, AT&T announced that it will offer subscribers ten channels of television programming. The images may be small, but the networks providing the content are some of the giants: CBS, Comedy Central, ESPN, FOX, MTV, NBC, NBC News, and Nickelodeon. AT&T will be using the MediFLO system, which is the same used by Verizon for its mobile television. Verizon...