Operating on-line marketplaces for sellers of goods and/or services; 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; Providing a web site which features advertisements for the goods and services of others on a global computer network; Providing a web-based system and online portals in the field of consumer-to-business commerce for consumers to enter, manage and modify their consumer preference information for use by merchants to create and manage offers for delivery to consumers; Providing a website featuring an online marketplace for exchanging goods and services with other users