Well, people have begun to sort things out with the Japanese Reactors and what is going on. By people I mean educated, credited and credible nuclear professionals. Currently if you want to see the best summary and most accurate check here: http://mitnse.com/ - The Massachussets Institute of Technology Nuclear Science and Engineering Nuclear Information Hub.
The folks from the United States sent to Japan are from the DOE. Amazingly the Japanese are looking to the US for expertise in Nuclear Accidents and Nuclear Technology.
Radiation Levels are dropping ath the Nuclear Power Plant Now, and in Tokyo as well.
PM1703m 7 uR/hr; PM1208 12 uSv/hr; Digilert 20 CPM