China, South Korea, India, Australia, The Philippines, and Pakistan have offered their help in rescue efforts. Other nations (including the US and Canada) have, as well. Considering that about the only country that likes to hate Japan worse than China and South Korea is North Korea, this gives you an idea of how massive this disaster is. (DO NOT start a political argument about Japan-Asia relations in my journal! My point here is that this disaster is so bad, Japan's political and economic adversaries are doing the right thing and putting aside their differences and offering unconditional help.)
Fukushima Daiichi Nuclear Reactor update My worst fears about this came true: An explosion happened. The evacuation has been expanded to 20km (12 miles), iodine is being distributed to people from the 20km-radius evacuation area, and early reports are that radiation levels are now lower. However, the explosion blew the roof off of the building. Radioactive materials have been detected outside, but this may have been due to the venting that had previously been done in an attempt to lower reactor pressure. BoingBoing's reporting is saying that one of the reactors' outer containment walls were blown off. Mainichi Daily News is reporting that Reactor #1's containment was not destroyed. Everyone agrees there was an explosion. The BBC tackles the situation in a sane, unsensationalistic way.
If you want to help: The following links point to donation funds organized to help disaster response and recovery for Japan. In a few cases, the links point straight to the organization's Japan relief campaign; the others point to the homepage where the campaign is pretty much front and center. The American Red Cross. Global Giving Caritas Internationalis Direct Relief
Important warning: The above organizations are probably not the only ones seeking donations to help fund disaster relief for Japan, but for every legitimate charity or relief organization, there are dozens of motherfuckers trying to scam people by setting up fake donation pages. If you want to give, make sure you're giving to a legitimate organization.
Old news about Fukushima Daiichi (outdated) The real scary thing now is that Reactor #1 at Fukushima Daiichi nuclear power plant is in big trouble, and a radioactive event could happen. If that wasn't bad enough, the latest news is that Reactor #2's cooling system has now failed, as well. Mainichi Daily News is reporting that a meltdown might've already happened in Daiichi #1. I should point out that these reactors are not going to explode the way Chernobyl did, but the danger is that radioactive materials may escape containment and get out into the surrounding area. Okuma is not in danger of becoming the next Pripyat, but this is still not a good situation.