This book constitutes the thoroughly refereed post-proceedings of the 5th IFIP WG 10.2 International Workshop on Software Technologies for Future Embedded and Ubiquitous Systems, SEUS 2007, held on Santorini Island, Greece, in May 2007 in conjunction with ISORC 2007, the 10th IEEE International Symposium on Object/component/service-oriented Real-time Distributed Computing.The 31 revised full papers and 4 revised short papers presented were carefully reviewed and selected from 102 submissions. The papers are organized in topical sections on ubiquitous computing frameworks, safety-critical systems, validation of embedded and ubiquitous systems, ubiquitous computing applications, scheduling and non functional properties, self-organization and reconfiguration, service discovery and development platform, wireless networks, middleware architectures and virtualization, and environment interaction.