Site allworldwars has some fascinating picture galleries of the fighting in the East in WWII:
ARTILLERY REGIMENT 78 IN RUSSIA, 1941/42:
AND GERMAN TROOPS IN BESSARABIA, UKRAINE AND CRIMEA, 1941-42 (3 parts)
You can find
more collections at their site.
Also englishrussia.com (link found through
commenter Joe Public) has some nice galleries, such as
perspective on WWII