If you have any distant relatives who lived in Russia and would have served in WWII, there's a great site to look them up. It only shows soldiers who have served and were either lost without a trace or killed.
However, they have scanned original copies of the records which show where & when the person was born, lists one close family member and an address for that family member.
Could be a useful clue for some: www.obd-memorial.ru
A great forum for family with Russian roots: www.vgd.ru