Editorials From the Editor i Feature Articles CrossFlow: Integrated Workflow Management and Electronic Commerce, Y. Hoffner, H. Ludwig, P. Grefen and K. Aberer 1 The Architecture of a One-Stop Web-Window Shop, Mona Marathe and Hemalatha Diwakar 11 Integration of Product Ontologies for B2B Marketplaces: A Preview, Borys Omelayenko 19 Efficiency and Price Discovery in Multi-item Auctions, Vipul Bansal and Rahul Garg 26 Conference and Workshop Reports Conference Report: The Second ACM Conference on Electronic Commerce, David M. Pennock 33 ISSN 1551-9031