Nuclear weapons
A short history of nuclear weapons was published by the Seattle Times on the 50th anniversary of the bomb.
Union of Concerned Scientists Has info about nuclear power as well.
The Bulletin of the Atomic Scientists - Home of The Clock
Federation of American Scientists
Carnegie Endowment for International Peace
Missile Defense Agency
Center for Defense Information
Dirty Bombs from PBS | from FAS
Depleted uranium was used as amunition in Gulf Wars I and II and in Yugoslavia and Chechnya. What's the deal? Is depleted uranium really a health threat? Fact sheet from the World Health Organization. More Info from the Federation of American Scientists and World Information Service on Energy. See also the Uranium Medical Research Center.
The Wikipedia article on nuclear weapons is a reasonable place for more context.