Databases covering relevant subject areas:
Articles from academic journals, magazines and newspapers plus e-books in all subject areas
Google Scholar searches specifically for scholarly literature - peer-reviewed papers, theses, books, preprints, etc. Some of the search results are available in full-text but many display only an abstract with links to pay-for-document services. You often may be able to retrieve the full-text of these articles by using the Skyline College Library Article Delivery Service.
A division of the Stanford University Libraries, HighWire Press hosts a large repository of peer-reviewed content, much of it available for free. Free content is clearly marked in search results.
Science in Context (Gale)
Detailed coverage of popular subjects from earth science and life science, to space, technology, mathematics and science history. Sources include Gale Encyclopedia of Science, Chemical Elements, Science in Dispute and Macmillan Science Library.