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; Marketing services, namely, providing informational web pages designed to generate sales traffic via hyperlinks to other web sites; 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