Google news patents credibility ranking system

A great idea? Slippery slope? More difficult than it might seem?

Google will give a credibility index to news reports based on

• number of stories from all news sources
• average story length in that article's source
  
• number with bylines
• number of the bureaux cited (sic)
• long they have been in business
• number of staff
• volume of internet traffic to its website
• number of countries accessing the site

OK, so now the question is: Which source gets a higher score--NPR, Fox, NBC, ABC, C-SPAN, Al Jazeera, BBC, San Jose Mercury, Slashdot?

And they could also rank "sales and services could in the future be listed on the basis of price and the reputation of the company involved."