1) RelicNews Forum: Painting and Modeling

2) 40k Online Painting Board

3) Canadian Painting Team Forum

4) Lost in Warp
The site of James K. Craig featuring his works, works of several outstanding painters from USA and Canada and a number of amazing tutorials, including Tutorial on Zenithal lighting and NMM by Vincent Hudon

5) BrushThralls.com (A number of hlepful tips and tutorials)
This site is dedicated to minitarure created by the Privateer press but it contains  a number of general articles that will be interessting for any aspiring miniature painter no matter what system he/she likes.

6) Fine Scale Modeler Magazine

7) Starship Modeller

8) Color Vision
For those of you interested in various aspects of color theory

9) Ultrawerke - vehicle painting and modeling
Taken directly from the site:  "A space to share modelling techniques on many subjects. While mainly centered upon scratchbuilding Warhammer 40K vehicles, you will also find the occasional WWII model."
10) военно-исторической миниатюра

11) Jeremie Bonamant Teboul's web site

Here you will find everything from beautiful miniatures sculpted and painted by Jeremie to extensive tutorials and articles describing how he does this. Very professionally made sand full of information site

12) Light Cage

Interesting site that demonstrate shadow/light distribution on human figure depending on the direction of light

13) The Web page of Jennifer Haley

Besides Galery of Jennifer’s miniatures this site features tutorial on painting skin and one of the best “freehand” tutorials out there.

14) The Secrets of using MIG pigments to enhance your models by Mig Jimenez

15) Victoria Lamb