This model company's home page has some simple painting guids for a variety of Napoleonic tropps/uniforms.

 

Online magazine devoted to miniatures. Mostly in Spanish.

 

Most of the examples provided are fantasy oriented, but there is a lot of great advice here on everything from the basics to the most advanced techniques.

 

Many plates of uniforms of the Army of the Duchy of Warsaw. There are also a few other assorted plates as well.

 

This Spanish language site is devoted to the battle of Talavera and includes detailed OOBs as well as some very helpful uniform information.