Art E Journals
TATEetc.
Nineteenth Century Art Worldwide: a journal of nineteenth century visual culture 

Art and Art History
Art History Resources on the Web-by Witcombe
Exploring Themes in American Art
Aesthetics Online from the American Society for Aesthetics
Dictionary of Art Historians
Timeline of Art History

Art Portals and Directories
Art Online
Intute Arts and Humanities
artnet
ArtSource
Ask Art