Papers from The American Ceramic Society's 31st International Conference on Advanced Ceramics and Composites, held in Daytona Beach, Florida, January 21-26, 2007. Content includes papers on recent technical progress by national laboratories, universities and private industries on solid oxide fuel cell technology including SOFC component materials, processing, cell/stack fabrication and design, electrochemical performance and stability, long-term chemical interactions, interface engineering, modeling, test procedures and performance analysis.