In recent years, various trends and technologies have emerged that have changed the perception and use of the World Wide Web. The term "Web 2.0" refers to the active and cooperative participation of globally connected network participants and user-friendly concepts that enable companies to engage in a closer dialogue with their customers than ever before. This significantly influences the competitive situation of existing companies in the net economy. The volume includes the current state of research on specific trends and technologies of Web 2.0 and places them in the business context of the net economy. The authors examine topics such as social software, personalization, web content management, cross-media publishing, web services, mashups, Ajax, rich internet technologies, software development, and community marketing.