Manta is a business database that offers free and pay-as-you-go business information.
According to the marketing materials, Manta gives Web users access to data and analysis from the most trusted business publishers in the world, including D&B, Newstex, Snapdata, Datamonitor, and ICON.
I’ve registered for Manta, and I’ve found the free information very useful. The sales numbers for privately held companies appear to come from Dun and Bradstreet, and I’ve found company information I haven’t been able to find using other free resources. It even appears that the slice of D & B that Manta is using is fresher than some other fee-based sources.