This may be a very powerful source of free content:
http://www.data.gov/

It's the XML feeds from the US gov. When I first posted this link, the service was brand new. It looks like they've added tons more stuff.

Just a very quick check showed:
-U.S. Overseas Loans and Grants

-Myfoodapedia provides information on the total calories; calories from solid fats, added sugars, and alcohol (extras);

-ENERGY STAR Find A Product
Tool to search for ENERGY STAR qualified products based on specific attributes. Currently there is a Find A Product query for Computers, Imaging Equipment, Monitors, Televisions ...

These are 3 very profitable niches...This is after just 30 seconds of "research".

Again, these are US gov data bases, so they are in the public domain.