Computerized on-line listing and print publications covering goods and services offered for sale or lease and services related to selling or leasing; providing an on-line interactive data base in the field of goods or services offered for sale or lease; preparing and disseminating advertising for others to facilitate goods or services offered for sales and leasing; electronic billboard advertising in the field of goods or services offered for sale and leasing; independent sales representative services in the field of goods or services offered for sale and leasing; computerized data base management in the nature of information storage and retrieval in the field of goods or services offered for sale and leasing; providing shoppers' guide information in the field of goods or services offered for sales and leasing; and referrals in the field of goods or services offered for sales and leasing