The Real Costs of "Free" Search Site Services
http://www.useit.com/alertbox/free_software.html

Nielsen, Jakob
Alertbox
2006

Abstract:

When owners of the big money tree use their excess profits to subsidize unrelated services, independent software vendors (ISVs) are driven out of business. Although such behavior got Microsoft into trouble in the past, ISVs shouldn't expect relief from search-engine-sponsored software from the U.S. Justice Department or the European Commission any time soon. These government agencies are notoriously behind the times, as proven by the fact that they attacked Microsoft only after it had won the browser war by cutting off Netscape's air supply.