PBS
Pbs Frontline: Russia's Nuclear Complex
An excellent map that shows where the loose nukes are located in Russia. Click on a region of the map to see what weapons that region has,as well as information about its weapon program. From a program that aired on November 19, 1996.
Council of Foreign Relations
Council on Foreign Relations: Loose Nukes
A brief discussion about what loose nukes are, where they are located, and what threats they pose to the world.