On-line trading services in which seller posts products to be auctioned and bidding is done via the Internet; On-line trading services in which users post requests for products and negotiate transactions via the Internet; Providing a searchable on-line advertising website and guide featuring the goods and services of other vendors via the Internet; Providing a searchable online advertising guide featuring the goods and services of online vendors; Advertising via electronic media and specifically the internet; Operating on-line marketplaces for sellers and buyers of goods and/or services; The bringing together, for the benefit of others, of a variety of goods and services, enabling customers to conveniently view and purchase those goods and services from an Internet web site particularly specializing in the marketing of the sale of goods and services of others