WAIM'2008 will continue the fine tradition of the previous WAIM' conferences in providing an international forum for researchers and practitioners in the Web and database communities to share and exchange new ideas, results, experience, techniques and tools related to all aspects of Web data management. The conference invites original research and industrial papers on the theory, design and implementation of Web-based information systems, as well as proposals for demonstrations, tutorials and panels. WAIM'2008 is expected to attract outstanding researchers from all over the world to ZhangJiajie, one of the most beautiful areas in China.