WMCS 2011: The 7th International Workshop on Mobile Commerce and Healthcare Services, September 21-23, 2011, Hualien, Taiwan; WMCS 2010: The 6th International Workshop on Mobile Commerce and Services, May 12-13, 2010, Hualien, Taiwan; WMCS 2009: The 5th International Workshop on Mobile Commerce and Services, June 4-6, 2009, Qingdao, China; WMCS 2008: The Fourth International Workshop on Mobile Commerce and Services, May 25-28, 2008, Kunming, China. EMOBS 2007: The First IEEE International Workshop on Engineering Mobile-Based Software and Applications, July 23-27, 2007, Beijing, China WMCS 2006: The Third IEEE International Workshop on Mobile Commerce and Wireless Services, June 26, 2006, San Francisco, CA, USA. WMCS 2005: The Second IEEE International Workshop on Mobile Commerce and Wireless Services, July 18-19, 2005, Munich, Germany.