"The 2nd Mobile and Ubiquitous Learning Environment (MULE) Workshop 2007 was successfully held from August 15 to 17 at the Centre for Information Technology in Education (CITE), Faculty of Education, The University of Hong Kong, sponsored by APSCE (http://cello.is.tokushima­u.ac.jp/ogata/MULE2007HK/venue.html) with US$100.00. This workshop was initiated by the steering committee consisting of Prof. Hiroaki Ogata, Prof. Masanori Sugimoto, Prof. Chen­Chung Liu and Prof. Tai­Wai Chan, and co­organized by CITE local organizers: Prof. Nancy Law, Prof. Daniel Churchill, and Ms Yanjie Song. Hiroaki organized the program. CITE provided facilities and places for free utilization, and helped prepare and arrange the registration and daily events of the workshop. PhD students Ms Carol Chu and Mr. Moushir EL­Bishouty also contributed to the preparation work. 14 professors and 9 graduate students in total were invited and participated in the interactive and fruitful workshop."