Philosopher's Index
Provides citations with abstracts to articles, books and other published literature on philosophy and related topics. Topics include:  aesthetics, epistemology, ethics, logic, and metaphysics. Also covers the philosophy of related interdisciplinary fields such as education, history, law, and science.

JSTOR
Provides access to the complete archives of major journals in a variety of subjects. JSTOR is a "moving wall" archive: newer years are added as publishers allow. For example, one journal may cover everything up to 3 years ago, while another may cover everything up to 5 years ago.