Presently broadcast television is allocated a certain/significant amount of spectrum, spectrum that could be used for other applications such as broadband. What is galling about this arrangement is that the government is conferring a scarce and hence extremely valuable resource for free. Mark Cuban suggests reclaiming the spectrum and auctioning it off. I wholeheartedly agree. In general, outside of reserving spectrum for first responders and for national security reasons I don't understand why the default presumption isn't to auction spectrum.
update: Whoops! I was hasty. Cuban also makes a good counter argument, along the lines of national security/emergency response, for why you wouldn't want to sell off spectrum. Anyhow, it's in interesting post, read it (all the way through I should say).