Making Open Access articles much more visible, automatically

"In April, I wrote about my desire to make OA publications much more visible on my academic wiki, and whenever I cite them. The first challenge was to capture the URL I downloaded the files from (ideally automatically), and then check if it is "truly" OA, and not just available to me because I am using the university network....So I figured out a way to get the URL from the file metadata, and created a simple API to check if the file was indeed a PDF, and available to the world. I then store this information in the bibtex metadata using the field oa-url and url (the url field is used by other software, but there is no guarantee that it points to a PDF, or that it's OA). Since then, I've upgraded the API to become much more robust..."