Vexillia has painting guides for the Thirty Years War in both pdf and epub formats.
With Mars Attacks now shipping, here’s a nice tutorial on how to paint the Martian menace.
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.
Massive Voodoo has a nice tutorial on painting Zombicide figures.