This book constitutes the refereed proceedings of the 9th International Conference on Ubiquitous Computing, UbiComp 2007, held in Innsbruck, Austria, in September 2007.

The 29 revised full papers presented were carefully reviewed and selected from 150 submissions. The papers address all current issues in the area of ubiquitous, pervasive and handheld computing systems and their applications including topics like: tools and techniques for designing, implementing, and evaluating ubiquitous computing systems, mobile, wireless, and ad hoc networking infrastructures for ubiquitous computing, laboratory and in situ studies of ubiquitous computing technologies in use, location-aware and context-based systems for ubiquitous computing, privacy, security, and trust in ubiquitous and pervasive systems.

This book constitutes the thoroughly refereed post-conference proceedings of the 7th International ICST Conference on Mobile and Ubiquitous Systems, MobiQuitous 2010, held in Sydney, Australia, in December 2010. The 24 revised full papers presented were carefully reviewed and selected from 105 submissions. They cover a wide range of topics ranging from papers architectures to toolkits and mechanisms for privacy, energy efficiency and content awareness. In addition there are 11 work in progress papers and a selection of the best poster and workshop papers.