Emma Tonkin looks at the current landscape of persistent identifiers, describes several current services, and examines the theoretical background behind their structure and use. <a href="/category/issue-number/issue56">issue56</a> July 2008 <a href="/category/article-type/feature-article">feature article</a> <a href="/taxonomy/term/809/author-info">emma tonkin</a> Emma Tonkin, Edward M. Corrado, Heather Lea Moulaison, Margaret E. I. Kipp, Andrea Resmini, Heather D. Pfeiffer and Qiping Zhang gather a series of international perspectives on the practice of social tagging of documents within a community context. <a href="/issue54">issue54</a> January 2008 <a href="/category/article-type/feature-article">feature article</a> <a href="/taxonomy/term/967/author-info">andrea resmini</a>, <a href="/taxonomy/term/964/author-info">edward m. corrado</a>, <a href="/taxonomy/term/809/author-info">emma tonkin</a>, <a href="/taxonomy/term/968/author-info">heather d. pfeiffer</a>, <a href="/taxonomy/term/965/author-info">heather lea moulaison</a>, <a href="/taxonomy/term/966/author-info">margaret e. i. kipp</a>, <a href="/taxonomy/term/969/author-info">qiping zhang</a> Greg Tourte and Emma Tonkin describe the set-up and use of video streaming technology at the IWMW 2006 event. <a href="/issue49">issue49</a> October 2006 <a href="/category/article-type/feature-article">feature article</a> <a href="/taxonomy/term/809/author-info">emma tonkin</a>, <a href="/taxonomy/term/901/author-info">greg tourte</a> Emma Tonkin reviews a book with interesting content despite a few rough edges. <a href="/issue49">issue49</a> October 2006 <a href="/category/article-type/review">review</a> <a href="/taxonomy/term/809/author-info">emma tonkin</a>