JustArtist.com lists great resources covering many topics related to artist information, computer graphics, craft, egg tempera, landscapes, museums, paint, oils painting, posters & prints, watercolors.
About.com : Drawing and Sketching
Offers tutorials and exercises for skill development. Includes articles, categorized links, a gallery where users can submit their drawings, and a forum. http://drawsketch.about.com/
Drawing Art gallery. Intended for artists just starting out in business. Popular guest art gallery of Mike Sibley Fine Art. View by artist or category.
For people who are learning to draw, teaching drawing or want to enhance creativity, a theory and set of techniques with accompanying materials and courses.