Art Technique & Tutorials

Artshow.com
Very nice site. Tutorials and galleries for painting, drawing, photo/digital, sculpture, printmaking, pastels, and ceramics.

Creativity-Portal.com
A huge directory of everything arts & crafts.  Links to supplies and tutorials.

Gurney Journey
Amazing blog from master artist James Gurney, creator of the Dinotopia books.

Pigments and their Chemical and artistic properties
Excellent site!

Portrait-artist.org
An excellent resource for aspiring portrait artists.  Tutorials, demonstrations.