This collection seeks to define the emerging field of "ubiquitous learning," an educational paradigm made possible in part by the omnipresence of digital media, supporting new modes of knowledge creation, communication, and access. As new media empower practically anyone to produce and disseminate knowledge, learning can now occur at any time and any place. The essays in this volume present key concepts, contextual factors, and current practices in this new field. Contributors are Simon J. Appleford, Patrick Berry, Jack Brighton, Bertram C. Bruce, Amber Buck, Nicholas C. Burbules, Orville Vernon Burton, Timothy Cash, Bill Cope, Alan Craig, Lisa Bouillion Diaz, Elizabeth M. Delacruz, Steve Downey, Guy Garnett, Steven E. Gump, Gail E. Hawisher, Caroline Haythornthwaite, Cory Holding, Wenhao David Huang, Eric Jakobsson, Tristan E. Johnson, Mary Kalantzis, Samuel Kamin, Karrie G. Karahalios, Joycelyn Landrum-Brown, Hannah Lee, Faye L. Lesht, Maria Lovett, Cheryl McFadden, Robert E. McGrath, James D. Myers, Christa Olson, James Onderdonk, Michael A. Peters, Evangeline S. Pianfetti, Paul Prior, Fazal Rizvi, Mei-Li Shih, Janine Solberg, Joseph Squier, Kona Taylor, Sharon Tettegah, Michael Twidale, Edee Norman Wiziecki, and Hanna Zhong.