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http://www.ncbi.nlm.nih.gov/pubmed/ All manuscripts with NIH funding must be open access within a period, which I think is 6 months. For example, you'll see a link in the top right that says Free in PMC, where you can get a free copy. You can create an account, and get alerts of new articles based on keywords, etc. PLOSOne is a free multidisciplinary journal that is Open Access. A lot of very good research appears in this journal. PLOS has several journals, all of which are open access (free online).