ParCo2007 marks a quarter of a century of the international conferences on parallel computing that started in Berlin in 1983. The aim of the conference is to give an overview of the state-of-the-art of the developments, applications and future trends in high-performance computing for all platforms. The conference addresses all aspects of parallel computing, including applications, hardware and software technologies as well as languages and development environments. Special emphasis was placed on the role of high-performance processing to solve real-life problems in all areas, including scienti.