For approxmately five years I ran the "Quake Skins Tutorial" hosted by PlanetQuake. While I no longer have the "Skins Tutorial" site I do make available here my tutorials I wrote there as well as I will from time to time make new and improved tutorials for your enjoyment as well.  This is now broken into two sections - "Modern" tutorials that I've written since moving on from the Quake skins era and the "Legacy" tutorials which may be as of this writing 5 years or older - their applicability may be limited at times.
 

Modern Tutorials

A series of UVW tutorials designed to take it from the absolute most basic steps and work your way up!

UVW Mapping Made Easy 101 :   Taking it from the very beging. How to UVW map a cube. It cant get any simplier than this.
UVW Mapping Made Easy 102:    Learn how to make multi sub object skin mappings and materials.
Coming Soon : UVW Mapping Made Easy 103:    Now that you've learned how to do a Cube lets do something slightly more complex. How about an Axe?!

Legacy Tutorials

1: Painting, Tools, and Brushes.
2: Palettes

Skinning Tutorials

1: A Tutorial on Creating Back Muscles.
2: Painting in "High Color" mode with a target 8 bit palette
3: Creating a Face