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In math and computer science posting your preprint is a pretty common. I rarely need to use a library/professional society account to read papers because CiteSeer or Google can usually find the preprint for me. I think physicists do it too, but maybe am_Unition will correct me. That might only work well because most of those papers are typeset by authors rather than by the journal, so that the preprint is pretty much identical to what gets published though.