SIGIR 2007 Workshop Multimedia Information Retrieval held in conjunction with the 30 th Annual International ACM SIGIR Conference 27 July 2007, Amsterdam Organizers Roelof van Zwol Yahoo! Research, Barcelona, Spain Stefan R¨ uger Knowledge Media Institute, The Open University, UK Mark Sanderson Dept. of Information Studies, University of Sheffield, UK Yosi Mass IBM Research, Haifa, Israel