A bit more on perspective. First, here is a link to a map of a few dozen independent radiation monitoring stations. You can click to see the radiation measurements in real time. http://bit.ly/ep3BJN
(For easier to understand info read this: http://bit.ly/e0jB9R) Second, back in school we talked about the "Banana Equivalent Dose." You see, bananas contain a lot of potassium, and a certain amount of the Earth's potassium is slightly radioactive. Eating a banana will expose you to about 0.1 microSv. Currently radiation levels in Tokyo are about the same exposure as eating 1.5 bananas.
I don't want to make light of the seriousness of the situation, but there is no radiation danger for those of us in Tokyo. Tim