The OAIster project is after my heart. How often have you been prompted to pay $30 to read an article found on Google Scholar search? Or been frustated by lack of access to the JSTOR database? Not here. We're talking about free materials. Quality materials. No sifting. Free access. Free. Free. Free.
Take everything you like about Highwire or the SSRN. But cut out the crap. And you have OAIster. To top it off, the search is excellent, allowing you to choose media type (audio, video, etc.) and the sorting of results. Even more features are on the way. This is how it should be.