3 links
Centre for Whistler Studies
histler.arts.gla.ac.uk
Searchable archive of about 10,000 items of Whistler's correspondence and information about related scholarly activities. From the University of Glasgow.
Olga's Gallery: James Abbott McNeill Whistler
abcgallery.com
Collection of images of his works with biography and historical comments.
WebMuseum: Whistler, James Abbott McNeill
ibiblio.org
Brief biography and his two most famous paintings.