The Wargames and Railroads Blog has a nice article on how to paint a WWI US Marine. Very appropriate in this, the 100th anniversary of the start of the Great War.
Painting Guides
Zombicide Figures Painting Tutorial
Massive Voodoo has a nice tutorial on painting Zombicide figures.
Painting Dark Age Figures Tutorial
Dux Homunculorum has a tutorial on painting dark age figures.
Painting British Infantry
Great Escape Games has a tutorial on painting WWII British Infantry.