Providing a web site that enables users to post items for sale through on-line classified advertisements; Providing a web site which features advertisements for the goods and services of others on a global computer network; Providing on-line directory information services also featuring hyperlinks to other web sites; Providing real estate leads for prospective purchasers; Providing space at a web site for the advertisement of the goods and services of others; Real estate advertising services; Real estate marketing services in the field of rent or lease to own single family homes, condominiums, townhomes, and duplexes; Real estate marketing services, namely, on-line services featuring tours of residential and commercial real estate; Rental of advertising space on web sites