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Forty Online free book sites: Mainly for college students.
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HathTrust: Digitized books, mostly out of copyright, from consortium of university libraries.
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Librivox: Listen to books or volunteer to read one aloud.
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Scribd: Social social publishing and reading site.
Folger Digital Texts: Shakespeare
Librivox: Free downloads.
Chegg Rent textbooks.
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Directory of Open Access Journals: Free peer-reveiwed articles.
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Textbook Media: Online textbooks, many free.
Ebooks in Other Languages
World Public Library: More than 500,000 PDF eBooks and eDocuments.