Written by Teoh Yi Chie, great for reviews of tools and materials, as well as art tutorials, art book reviews etc.
Blog of James Gurney, of Dinotopia fame. Fantastic entries of practical nuts and bolts type stuff (colour theory, composition, etc), fun, interesting posts and… dinosaurs! And here’s a Boing Boing post about what James Gurney takes in his sketch book bag.
Art Instruction Blog tutorials by artists.
Ideas Made of Light
This is a great site, Scott McDaniel picks various illustrations and analyses them from all aspects (colour, texture etc) but I find the composition section most useful.
The Art List
A newsletter about competitions and exhibitions looking for work, mostly in America but usually open to all.