http://www.cdc.gov/ http://www.fda.gov/cder/ndc/database/Default.htm
The above two sites have all United States pills listed; by either manufacturer, ingredients, or numbers on the pills.
I searched all day, for some information to confirm that my insurance company's online pharmacy didn't screw up my order-AGAIN! They don't provide images of generics on their website, and constantly fill the Rx with different numbered pills.
When I went to the CDC site, and linked to the FDA site, I was able to find my answer within minutes.
Strange that the government would be this efficient, but it works!!