Author describes two situations in research and development activity in library science that demonstrate how philosophical ideas and concepts support to spread creative spirit to librarianship. First refers to modulus when, starting from syntagma „role of infrastructure of the national library”, a new conception of role of the national library and library science centers of other levels inside the National Library System was created. This new conception is called an Integrated System of Library Infrastructure. Its implementation will help to modernize thoroughly the national librarianship. Second situation refers to apparition of the concept Web 2.0. His author, Darcy DiNucci, refers to philosophical models when describes a compound ontology of the Web, creating the renewing ideas which have already and will have in a future a special role in development and advancement of society of knowledge.