Here is one fine information source on the concentration of corporate control over the media.

FREE PRESS

Free Press is a national nonpartisan organization working to increase informed public participation in crucial media policy debates, and to generate policies that will produce a more competitive and public interest-oriented media system with a strong nonprofit and noncommercial sector.

We believe that a more democratic US media system will lead to better public policies — at home and abroad. As our world becomes more and more interconnected, it is imperative that any kind of development takes into account basic environment, economic, and human rights, while defining corporate and personal responsibilities. Free Press considers information to be among the most important resources to any society. We strive to open up the media system to allow more diversity of opinion to be expressed, to present a broader perspective, and to increase the caliber of information available to everyday people. This, in turn, will lead to a more participatory and accountable government and to more sustainable policies and practices regarding national and global development.