Web of Science (ISI Web of Knowledge) - provides researchers, administrators, faculty, and students with quick, powerful access to the world's leading citation databases. Authoritative, multidisciplinary content covers over 10,000 of the highest impact journals worldwide, including Open Access journals and over 110,000 conference proceedings. You'll find current and retrospective coverage in the sciences, social sciences, arts, and humanities, with coverage available to 1900. (from ISI homepage)
Academic Search Premier - (Indexing begins 1984-; earliest Full Text from 1990-) Provides citations and abstracts to over 4,000 journals covering most academic areas of study including biological sciences, economics, communications, computer sciences, engineering, language and linguistics, arts and literature, medical sciences, and women's studies. Approximately two-thirds of the articles are available as full text. Also contains images which can be accessed by clicking on the "image collections" icon. (from EbscoHost website)
ScienceDirect - Web database for scientific research that contains abstracts, articles and full text of Elsevier Science journals in the life, physical, medical, technical, and social sciences. Contains abstracts from the core journals in major scientific disciplines. The journals are arranged under subject areas for topical navigation. Date coverage varies with individual titles.