Textures

http://stefan-morrell.com/  (see the tutorial on hard surfaces in the download section)

http://www.gamasutra.com/features/20060622/ahearn_01.shtml  (very good book, including all the basics you need to start making 2d artwork for games)

http://lvlworld.com/t.php/ThreeWave+Textures     ThreeWave Textures (Note: _not_ to copy them, just to see what others did)




Q3 Shader Manual

http://toolz.nexuizninjaz.com/shader/




Gimp & Misc

www.gimpusers.com/tutorials.php

http://www.techzilo.com/gimp-brushes/  Brushes for gimp

http://registry.gimp.org/node/186  Layer Style Plugin for gimp

www.ratemydrawings.com/tutorials (Drawing art)

http://pwrinfo.com/cartoon-drawing-course/cartoon-drawing-tutorials.htm

www.drawingnow.com/ (more drawings)



(more are following)