Every day the crisis of Japan's nuclear reactors that were damaged in the earthquake and tsunami gets worse. Currently, one of the reactors is on fire and there's no way to know how much radiation the reactor is leaking and whether it will stay localized or of it poses a threat to other countries.
If you don't have potassium iodide or iodate now, good luck finding any. Probably the only sources available are from the 'greedsters' on eBay. This is why we prepare, so we have the resources available when a disaster or crisis event occurs. Once the event happens, the odds that you'll be able to get what you need drop to nil.