On-line trading services in which items to be sold are posted by newspaper classified ad web sites and where buyers can post offers and sellers can accept or reject those offers. Also providing evaluative feedback and ratings of sellers' goods and services, the value and prices of sellers' goods, buyers' and sellers' performance, delivery and overall trading experience in connection therewith. Facilitating classified ad transactions by providing a platform for communication between buyers and sellers of classified ad items via a global computer network;; On-line trading services in which items to be sold are posted by newspaper classified ad web sites and where buyers can post offers and sellers can accept or reject those offers. Also providing evaluative feedback and ratings of sellers' goods and services, the value and prices of sellers' goods, buyers' and sellers' performance, delivery and overall trading experience in connection therewith. Facilitating classified ad transactions by providing a platform for communication between buyers and sellers of classified ad items via a global computer network;