http://omniatlas.com/ Collection of maps compiled with the site's own style. Has enough detail to show points such as South Yemen's emirates or Chinese warlords.
http://www.emersonkent.com/maps.htm Collection of maps from external sources, including quality ones from the US Military Academy Department of History and the 1912 Cambridge Modern History Atlas.
The first is an insider's thorough description of the Soviet Army, though he also writes about the ther branches. Suvorov discusses conscription (and draft dodging), training, the life of a soldier and an officer, military education, equipment, mobilization, deployment, organization and hierarchy, doctrine -including nuclear doctrine- and, most interestingly, the USSR's power structure, which he describes as a triumvirate between the Armed Forces, the Party and the intelligence service, and proves his point by narrating the post-Stalin power struggle as a battle between those three forces. His style is easy to read and at times ironic (pic related). The site has another book of his on Soviet intelligence.
The second is a very assburgerish book on the Eastern front from planning stages to the Battle of Moscow. I found it while researching German invasion plans and haven't read much beyond the first chapter.