1. 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: a communication interface for: sending 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 receiving 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 computer storage device for storing the advertisement listings; and a publication means for publishing web page content and advertisement listings to an end user requesting a page associated with a particular node within the multi-node hierarchical system, the publication means delivering content and one or more advertisements associated with the node.
1. 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: a communication interface for: sending 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 receiving 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 computer storage device for storing the advertisement listings; and a publication means for publishing web page content and advertisement listings to an end user requesting a page associated with a particular node within the multi-node hierarchical system, the publication means delivering content and one or more advertisements associated with the node. 3. The Internet advertising system of claim 1 wherein: the individual nodes are associated with each other in a hierarchical structure.