Really nice tutorial on the theory behind painting, both digitally and traditionally. Lots opf helpfull stuff about lighting, go read this: http://www.itchstudios.com/psg/art_tut.htm
Feng Zhu: http://www.artbyfeng.com
Seung Ho: http://go.to/seungho
Michael Tarwater: http://www.anycities.com/user/tarwater
James Hawkins: http://www.hawkprey.com
Jason Dalton: http://www.planetquake.com/polycount.../crystalmesh3d
David King: http://www.planetquake.com/polycount...es/kingscastle
Daniel Forsgren: http://www.danielforsgren.com
Craig Mullins: http://www.goodbrush.com/mainpage/index2.htm
Hyung-Tae Kim: http://www.hyung-taekim.org
Khang Le: http://www.khangle.net
A. Niklas Jansson: http://www.itchstudios.com/psg
Nicolas "Sparth" Bouvier: http://perso.wanadoo.fr/arth
Justin Cherry: http://www.nivbed.com
Frank Frazetta: http://www.die-einherjar.de
Jon Foster: http://www.jonfoster.com
Contains forums, tutorials and portfolios
Does contain some 2D art forums
Excellent anatomy reference, includes manga, animal references, muscle photos and lots more.
Gallery and forums.
2d & 3d art forums
Digital art forums.
Great for anyone into car design, lots of examples of excellent renderings, and forums.
Galleries, contests & more.
Sci-fi & Fantasy art site.
TDR's custom brush list
If you want to add some more post them and I'll add them to the list.
[UPDATE] Added some of the sites suggested by other people and a few I've found useful.
Anyone that's into industrial design style stuff should check out Daniel Forsgren.[/UPDATE]
[UPDATE: Feb 6, 04] Added a few more sites, a number of these artists can be found at conceptart.org (check out thunderdome 7, ends on the 10th).[/UPDATE]