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* CiteSeerX -- source of 'cited by' info, AND, most excitingly, open access pre-prints. But their Atom/RSS feeds (the only API I could find) don't seem to advertise enough info to actually use these features. Would need to talk to developer team -- possibly offer to help code? Also not entirely clear how big their corpus actually is, if it's worth it.
* Try screen-scraping Google Scholar (and maybe Microsoft Academic) to get the open access full text links they find. Also, there's a Springer API for open access content now. http://dev.springer.com/docs/Restful_operations
* When no full text is found, provide link to search on Google Scholar, or Bing Academic? Need to have sufficient metadata to create the search. Oct 2010 Library Technology Reports article has some ideas, I think.