You may find the following links useful:

Women Against War
www.codepinkalert.org

Olga's Gallery: access to worldwide art
www.abcgallery.com

Independent Poetry Publisher:
www.offthegridpress.net

Dia Center for the Arts
http://www.diacenter.org/

Colophon Books
http://www.colophon.com/gallery/kernan

The Gardner Museum
http://www.gardnermuseum.org

Nexus Gallery
http:www.nexusphiladelphia.org

Sean Scully, an excellent painter (see his Wall of Light) whose work inspired my Book without Words: Ashes
http://www.jca-online.com/scully.html

Nancy Herrington, artist with links to other artists
www.nancyherrington.us