re: Question:
"Plutonium goes into a typical weapon (kilos, tens, hundreds of kilos?) but with all the decommisioned weapons from the Cold War, there might be enough to make a difference. Anybody know?"
I heard they were using the weapon rate stuff for fuel, don't have reference & can't remember where I heard this.
Also believe about 50 kilogram of plutonium is used in bomb. Oh, but according to this: "The report states: "Assuming that the recently unloaded fuel has not yet been separated, the DPRK has about 15-38 kilograms of separated plutonium. At 4-5 kilograms of plutonium per weapon, this plutonium is enough for 3-9 nuclear weapons."
http://www.nautilus.org/napsnet/sr/2005/0585ISIS.html
So, only off by factor of ten:).