10. An Internet advertising system for receiving advertisement information from advertisers for publication through a multi-node hierarchical content-based system, the Internet advertising system comprising: an interactive database server that sends a multi-level representation of at least a portion of the hierarchy of content nodes to a plurality of advertiser user systems to facilitate selection of one or more of the nodes, the hierarchy of content nodes providing a categorization of information and each content node being associated with one or more web pages, and receives advertisement listing information from a plurality of advertiser user systems connecting to the Internet advertising system over the Internet, the advertisement listing information comprising an advertisement title and URL, a selection of one or more nodes with which the advertisement listing information is to be associated, and a bid amount for each node selected; a database that stores the advertisement listings; and a network file server that delivers web page content and advertisement listings to a plurality of end users requesting one or more pages associated with one or more nodes in the multi-node hierarchical system, the content and advertisement listings delivered being based on the node associated with the page by an end user.
10. An Internet advertising system for receiving advertisement information from advertisers for publication through a multi-node hierarchical content-based system, the Internet advertising system comprising: an interactive database server that sends a multi-level representation of at least a portion of the hierarchy of content nodes to a plurality of advertiser user systems to facilitate selection of one or more of the nodes, the hierarchy of content nodes providing a categorization of information and each content node being associated with one or more web pages, and receives advertisement listing information from a plurality of advertiser user systems connecting to the Internet advertising system over the Internet, the advertisement listing information comprising an advertisement title and URL, a selection of one or more nodes with which the advertisement listing information is to be associated, and a bid amount for each node selected; a database that stores the advertisement listings; and a network file server that delivers web page content and advertisement listings to a plurality of end users requesting one or more pages associated with one or more nodes in the multi-node hierarchical system, the content and advertisement listings delivered being based on the node associated with the page by an end user. 12. The Internet advertising system of claim 10 wherein: the individual nodes are associated with each other in a hierarchical structure.