Providing a web site whereby buyers of goods or services locate and receive quotations from multiple competitive sources and sellers of goods or services identify and bid on multiple new sales opportunities; on-line trading services to facilitate the sale of goods and services by others via a computer network; providing commercial information and on-line directory information services for sellers, producers and organizations; providing a searchable online database of products and services, producers and sellers; business services, namely, providing computer databases regarding the purchase and sale of a wide variety of products and services of others; providing information about the goods and services of others via the global computer network; advertising and advertisement services