The Protein Data Bank (PDB) is the primary source of macromolecular structure data for a worldwide community of users. A subset of those users then process these data to derive secondary information which is also available on the WWW. This process includes validation, some form of reductionism, via sequence or structure, or visualization. The result, a set of further web-accessible resources on protein structure and functional classification, links to primary genomic information, protein-protein and protein-ligand interactions, protein dynamics and protein-modeling resources. This paper reports on these processes and a subset of the web resources that result.