My paper describing the mapping between NCBI and Wikipedia has been published in PLoS Currents: Tree of Life. You can see the paper here. It's only just gone live, so it's yet to get a PubMed Central number (one of the nice features of PLoS Currents is that the articles get archived in PMC).Publishing in PLoS Currents: Tree of Life was a pleasant experience. The Google Knol editing environment was easy to use, and the reviewing process quick.