SUMMARY
Library 2.0 is a theoretical concept launched by Casey in 2005, which has been transformed into a practical model applied worldwide by the libraries ready to move toward major change and innovation, willing to redefine and revitalize their services in accordance with users’ needs and expectations, accepting users’ participation as communication partners and knowledge contributors. Library 2.0 represents a virtual set of library user-centered services, built on solid principles like radical trust, collective intelligence, creative thinking, collaboration, openness, community knowledge management, content free use and reuse, social networking, people interactivity and feedback encouragement. It is supported by the Web 2.0 technologies, configured as a public sphere, providing an innovative platform for knowledge dissemination for library users and nonusers with the aim of bringing them into the library virtual or physical environment. Library 2.0 uses both the Web 2.0 tools and specialized instruments like the Next Generation Catalogue or the open access information repository which offer unexpected, serendipitous ways of information discovery.The Library 2.0 challenge has been taken up by the Romanian libraries. The paper presents a brief overview of the Romanian libraries response to this challenge, investigating the status of Library 2.0 tools acceptance and implementation, pointing out the Library 2.0 drivers and impacts in the Romanian information and documentary structures.