The Eighth Annual International Conference on Mobile and Ubiquitous Systems: Computing, Networking and Services (MobiQuitous 2011) will provide a forum for practitioners and researchers from diverse backgrounds to interact and exchange experiences about the design and implementation of mobile and ubiquitous systems. Areas addressed by the conference include systems, applications, social networks, middleware, networking, data management and services, all with special focus on mobility and ubiquitous computing. Papers: We solicit technical papers describing original, previously unpublished research, not currently under review by another conference or journal. Submissions should clearly identify how they relate to issues on mobile and ubiquitous systems. Contributions describing an overall working system are particularly of interest. Topics include, but are not limited to, the following: Ubiquitous architectures, systems and applications Wearable computing and personal area networks Enabling wireless technologies (Bluetooth, ZigBee, 802.15.x, WiFi, WiMAX) Ad hoc and sensor network for ubiquitous computing Reconfigurability and personalization Wireless/mobile service management and delivery Security, privacyand trust of mobile and ubiquitous systems Social networks Community based computing Service and knowledge discovery, matching and composition mechanisms Localization and tracking in ubiquitous environments Context- and location-aware applications Agent technologies in ubiquitous, wearable, and mobile systems Energy-efficient and green ubiquitous systems Toolkits, testbeds, development environments, and languages for ubiquitous computing Rapid prototyping of ubiquitous applications Mobile and ubiquitous data management and processing Data replication, migration and dissemination in ubiquitous environments Queries, transactions and workflows in mobile and ubiquitous environments Multimodal sensing and interfaces User generated content Submission Instructions: Paper submission will be handled electronically (see the instructions). Authors should prepare an Adobe Acrobat PDF version of their full paper. Papers must not exceed 12 pages single column (US Letter size, 8.5 x 11 inches) including text, figures and references. The font size must be at least 10 points. Pubblication: Papers will be rigorously reviewed by the international technical program committee. Accepted papers will be published by Springer in the Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering (LNICST) series.