This book constitutes the refereed proceedings of the 8th International Conference on Electronic Commerce and Web Technologies, EC-Web 2007, held in Regensburg, Germany, September 3-7, 2007 in conjunction with Dexa 2007.

The 22 revised full papers presented were carefully reviewed and selected from 67 submissions. The papers are organized in topical sections on recommender systems, business process / design aspects, mobile commerce, security and e-payment, Web services computing / semantic Web, e-negotiation and agent mediated systems, and issues in Web advertising.