Artizan Designs has a page with very good painting guides for a wide variety of World War II Uniforms.
This is a pretty neat little YouTube video of two guys and a WWII game. You’ll love the stop action animation.
Luft ’46 is a site that offers a wealth of information on aircraft projects that the Germans had in line is World War II had lasted a year or more longer. Fascinating stuff. I’d like to see some of these show up on a wargames table.