If you haven't checked out the report on Misinformation and the 2010 Electorate (20-page PDF), please do so. But please remember one thing. Misinformation is not new. Regardless that Fox News is highlighted as presenting the most misinformation, what I get from the entire report is that we're increasingly lacking truly impartial and ethical journalism across the board.
For a recent example, have a look at how the media and our political leaders are reacting to the "devastating" leak of State Department cables.