The Digital Library offers full text articles from every publication (journals, magazines, conference proceedings, transactions, etc.) of the Association for Computing Machinery (ACM). Also includes the ACM's Guide to Computing Literature, which offers bibliographic citations from major computing publishers.
An especially valuable form of secondary literature. Articles in the Annual Review series are comprehensive, dependable, and offer sizeable bibliographies; if you can find an article on your topic, it will probably point you to most of the relevant primary literature which had appeared up to its publication date, and give you a firm basis for understanding the evolution of research traditions in that subfield.
A digital archive of over 1,100 important scholarly journals. All issues of each journal are included in full-text except for the most recent 2-to-5 years, based on JSTOR's agreement with the journal's publisher.
August 2009 update: JSTOR is developing Data for Research, a tool for analysis of the content of the database.
The American Physical Society's PROLA archive contains PDF images of all pages of Physical Review 1893-2007 and Reviews of Modern Physics 1929-present, and thus extends W&L's holdings, makes the whole collection searchable, and delivers the results to individual desktops. This online resource should be much more useable than the bound volumes.
Full-text access to recent issues of over 220 journal titles from 37 scholarly publishers. Covers literature and criticism, history, the visual and performing arts, cultural studies, education, political science, gender studies, economics, and other disciplines.
Definitive source of searchable full-text, peer-reviewed scholarly and scientific articles in psychology. The database covers general psychology and specialized, basic, applied, clinical and theoretical research. The database contains more than 40,000 articles from 56 journals - 45 published by the American Psychological Association (APA) and 11 from allied organizations. It includes all journal articles, letters to the editor and errata from each journal. Now includes the APA Historical Backfile, which provides access to content as far back as 1894 for some titles. The contents of PsycArticles are incorporated into the PsycInfo database.
Full-text coverage of nearly 300 journals, including 262 peer-reviewed publications, "covering topics such as world religions, major denominations, biblical studies, religious history, epistemology, political philosophy, philosophy of language, moral philosophy and the history of philosophy."
Online full text access to our subscriptions to journals published by Elsevier, with an archive starting in 1999. This includes the Trends in . . . journals, Tetrahedron Letters, Journal of Environmental Economics and Management, and many others. The database allows searching on over 1,700 journals from Elsevier Science including top titles such as The Lancet, Cell, and Tetrahedron and over three million articles and over 59 million abstracts from all fields of science.
Formerly Blackwell Synergy and Wiley InterScience. A collection of over 700 journals, mostly in the natural, physical and social sciences.
The chronological extent of coverage differs among the journals, with most beginning in the 1990's.