Do some searching by subject and find fabulous resources
available from the Duke University Libraries; choose "subject" from the dropdown in place of "keyword" and then filter your search to "online access"!
Some subject headings to try:
The online databases might prove fruitful:
Issues and controversies - database that explores more than 900 hot topics in business, politics, government, education, and popular culture.
Oxford Art Online - Dictionary of Art and Encyclopedia of Aesthetics from Oxford University Press.
Oxford Reference Online (includes photography)
And the eBooks below can also provide background information, generate topic ideas, etc.: