First of all i would like to say that i'm a big fan of  Leigh van der byl.
Here are few verry great articles by Leigh:

Texturing Articles: (1.5Mb PDF Document, includes images)
http://leigh.cgcommunity.com/pdf/texturing.zip
"A series of basic articles aimed at introducing the fundamentals of texturing, covering the various aspects of surface (colour, diffuse, reflection, bump, etc) and giving some advice for getting started as a texturing artist.
A little out of date, but hopefully still somewhat useful."
 Size Does Count! ( 81kb PDF Document )
http://leigh.cgcommunity.com/pdf/size_does_count.pdf
" What size are you supposed to create your textures? This article will solve this mystery for you! Learn to calculate the correct size for your textures to maximise quality and detail. This article pertains to texturing for film/TV, and not for games.."
 Photoshop Tips and Tricks for Texturing Artists (540Kb PDF Document)
http://leigh.cgcommunity.com/pdf/PhotoshopTips.pdf
CGTalk
The best CG forums out here!
http://forums.cgsociety.org/index.php?
Hosted by www.Geocities.ws

1