The Distributed National Electronic Resource (DNER) is a managed information environment for accessing quality assured Internet resources from many sources. These resources include scholarly journals, monographs, textbooks, learning objects, abstracts, manuscripts, maps, music scores, still images, geospatial images and other kinds of vector and numeric data, as well as moving picture and sound collections.
Roger Fischer from bitflux asked me about RDF implementations for digital libraries. Actually, there are almost none. This seems to be due to the fact that RDF is still an evolving technology, thus not used in production environments. Peter Gietz from DAASI pointed me to some interesting documents:
Search Mesh Topology and Visualisation
An Extensible Approach for Modeling Ontologies in RDF(S)