Signaling of OA-ness of references used in Wikipedia Signpost
Gathering of usage stats of files from OA sources
Uploading OA files for use on articles that lack suitable illustrations
Wikipedia Cite-o-Meter
Collaboration with academic journals on getting peer-reviewed materials onto Wikipedia, including some articles specifically designed for that purpose
Co-wrote an article on how the non-commercial clause in CC licenses impedes the dissemination of scientific information, taking biodiversity as an example. In most cases, dropping the -NC clause would mean that the materials become eligible for reuse on Wikimedia projects. WebMed Central reacted by dropping the -NC and switching to CC BY.