Emma Tonkin of UKOLN gave a presentation entitled “Kinds of Tags: a collaborative research study on tag usage and structure” during the 6th European Networked Knowledge Organization Systems (NKOS) Workshop at ECDL 2007. The presentation, which she co-authored with Ana Alice Baptista, Seth van Hooland, Andrea Resmini, Eva Mendez and Liddy Neville, is now available together with other presentations from the Workshop.