Conferences 2.0 discusses how web technologies can enhance scientific conferences. It defines conferences as places to meet, share knowledge, learn, and build networks. The document outlines how the web supports conferences before, during, and after an event through tools like event websites, social networks, wikis, blogs and feeds to diffuse information, share research, and strengthen networks. It concludes conferences should embrace openness, digital formats, and web linking to fully leverage the potential of Web 2.0 technologies.