Nature today published a report on the prevalence of duplicate papers in Medline. In this report Mounir Errami and Harold Garner estimate that there as many as 200.000 duplicate papers in Medline or 1% of all published papers. The article has already been widely cited, including of course Nature News and Nature Network, but also Noble Intent and DigitalKoans. The original paper by Errami and Garner was published in Bioinformatics .