I don’t know how a company can apply for a patent for matching content supply with search demand but apparently Demand Media has applied for just such a patent.
The Demand Media Patent Aplication Description:
Method and System for Ranking of Keywords for Profitability
The Demand Media Patent Application Abstract:
A physical computing device receives information regarding a total number of people who are searching on the search term. Information is received regarding an amount advertisers pay for the search term. Information is received regarding a click through rate of the search term. A traffic estimate of the search term is determined. Longevity of the search term is determined.