Philosopher's Index
(via Cambridge Scientific Abstracts)

Contains citations and abstracts to books and journal articles in the field of philosophy, 1940-present.

These general databases cover all topics, including philosophy:

ProQuest

Full-text articles, citations and abstracts covering all subjects.

Wilson OmniFile Fulltext

Full-text articles, citations and abstracts covering all subjects.

These two databases provide online journals:

JSTOR

Historical coverage of Arts and Social Sciences journals. Includes full-text coverage of 12 philosophy journals as far back as the nineteenth century.

Project Muse

Over 100 full-text electronic journals in the humanities and social sciences, including several philosophy journals.

These two databases have full text newspaper articles:

LexisNexis Academic

Hundreds of regional, national, and international newspapers; business publications, and much more.

ProQuest Newspapers

Nine national newspapers including the Los Angeles Times and Wall Street Journal.

Remember to search resources in other subject disciplines for articles that may cover your topic from a different perspective.