Advertising services; Operating on-line marketplaces for sellers and buyers of goods and/or services; Commercial evaluation and rating of consumer goods for others prior to purchase; 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 other on-line vendors on the internet; Providing an on-line searchable database featuring used books being offered for sale and buyer/seller contact information; Providing commercial information and advice for consumers in the choice of products and services; Providing consumer product information for the purpose of selecting environmentally friendly products to meet the consumer's specifications; Provision of an online marketplace for buyers and sellers of goods and services