Here is a very useful site that has a lot of information on markings, tanks aces, and general stuff about the war.
http://wio.ru/index.htm
It also has a lot of pictures, some color.  

Tanks:
http://wio.ru/index.htm
Infantry:
http://wio.ru/galgrnd/ww2inf.htm
Artillery:
http://wio.ru/galgrnd/ww2gun.htm

Spasibo bolshoye !! 

Some good stuff there. Very useful.