Companies have been focused on using the Internet to market goods and services to the consumer. Many see this as the major revenue stream on the net. But there is an undiscovered El Dorado, a goldmine of opportunity that very few have begun to mine.Traditionally, companies have tried to capitalize on the Internet by establishing a Web page where consumers can research and buy products or services on-line. These Web sites are elaborate brochures touting the company's many qualities and competenci.