@pandabear: As I noted, it is safe to visit Japan. Your concerns will mostly be regional; so, unless you're planning to go to the Fukushima area, you're very likely to be perfectly safe. The primary issues relate to long-term threats over many years, not if you are just coming to visit.
If you need some specific information on radiation, perhaps this recent update on radiation and food safety in Japan will help you understand that it is not something you as a visitor have to be that concerned about when considering a trip: http://www.jnto.go.jp/eq/eng/04_recovery.htm
If you have more specific questions, I can try to find whatever there is to help explain further, but in general, the answer to your question is "the radiation is still an issue for the plant and surrounding area, but it is not a major issue for someone coming to visit other parts of the country". So, please don't let concerns over the nuclear plant crisis keep you from visiting Japan.
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