Since late 2000 bibliotek.dk has been giving all Danes access to the Danish National Union Catalogue. The development of this new service is described. The new facilities are seen from both the libraries’ point of view and from the user’s perspective. bibliotek.dk is not only a database, but also a portal with access to a wide range of library Net services. The actual development plan for bibliotek.dk is described in detail. Several initiatives to enrich the access to information and to rationalise the libraries’ work with bibliotek.dk are presented. The service is also used as the basis for the development of new services to the user, including an “Available for sale” button which gives access to the vendors of a specific item.