THE WINDSOR PALETTE AND BRUSH CLUB

http://www.wetcanvas.com Art tips and demonstrations in many media
http://www.armchairpaintclasses.com Tutorials and workshops
http://www.winsornewton.com Links, hints, techniques for watercolor, oil, acrylic or pastel

http://www.watercolormagic.com Watercolor Magic magazine
http://nitaleland.com Exploring color with Nita Leland, virtual tours of artists' studios
http://lavendera.com/paint%20tech/paintechmenu.htm  Oil Painting like the Old Masters
http://www2.evansville.edu/studiochalkboard/paint.html  The Art Studio Chalkboard - good for beginning oil painters
http://www.gamblincolors.com/howtp.html  Articles on direct and indirect painting, grounds, varnishes, etc.
http://glassgems.net/scribble  The world of colored pencil
http://www.annkullberg.com   From My Perspective is a monthly colored pencil magazine

Florence Griswold Art Museum, Old Lyme  http://www.flogris.org
Isabella Stewart Gardner Museum, Boston  http://www.gardnermuseum.org
Massachusetts Museum of Contemporary Art (Mass MoCA)  http://www.massmoca.org
Mattatuck Museum, Waterbury  http://www.mattatuckmuseum.org
Metropolitan Museum of Art, New York  http://www.metmuseum.org
Museum of Fine Arts, Boston  http://www.mfa.org
Museum of Modern Art, New York  http://www.moma.org
National Gallery of Art, Washington, DC  http://www.nga.gov
New Britain Museum of American Art  http://www.nbmaa.org
Real Art Ways http://www.realartways.org/visualarts.htm
Rhode Island School of Design Museum, Providence  http://www.risd.edu
Springfield Museums at the Quadrangle  http://www.quadrangle.org
Sterling & Francine Clark Art Institute, Williamstown, MA  http://www.clarkart.edu
Vassar College, Frances Lehman Loeb Art Center  http://fllac.vassar.edu 
Wadsworth Atheneum http://www.wadsworthatheneum.org
West Hartford Art League http://www.WHAL.org
Worcester Art Museumhttp://www.worcesterart.org
Yale Center for British Art, New Haven http://www.yale.edu/ycba
Yale University Art Galleryhttp://artgallery.yale.edu

American Society of Portrait Artists  http://www.asopa.com
American Watercolor Society  http://www.americanwatercolorsociety.com
Colored Pencil Society of America  http://www.cpsa.org
National Acrylic Painters Association  http://www.napauk.org
National Watercolor Society  http://www.nws-online.org
Pastel Society of America  http://www.pastelsocietyofamerica.org/main
Portrait Society of America  http://www.portraitsociety.com

http://sunsite.dk/cgfa/index.html  CGFA is a non-profit site from Denmark, which contains images of hundreds of paintings by well-known artists,searchable by the artist's name, by  nationality, and by time frame.