Ubiquitous Computing, an idea introduced by Mark Weiser , and often bracketed with slight modifications under the concepts of Pervasive Computing or Ambient Intelligence, imagines in the extreme case the entire mesosphere saturated by information and communication technologies . All of the essays of this issue probe the practices, ideologies, and power relations of UbiComp development. They note both the successes and the failures of a variety of ethical and theoretical approaches to UbiComp and they offer alternative approaches. (...) Thus they provide a much-needed intervention into the creation of new forms of subjectivity, awareness, and power. (shrink)