Ways to Help Japan
Here are some organizations that are doing on-the-ground work in Japan right now. They are all "trustworthy brands", so to speak, but they all operate differently (earmarked vs. non-earmarked funds, crowdsourcing, etc.) so do your due diligence. Japan is a wealthy country in many ways, but the damage to lives and property is catastrophic and unprecedented, so please consider giving. International Medical Corps (via Groupon)
Doctors Without Borders (does not accept "earmarked" donations, i.e., donations specifically for Japan)
Peace Winds Japan (a Japanese disaster-relief organization)
Global Giving (raises funds for other organizations, including International Medical Corps and Save the Children)
Finally, there are scammers out there, so use common sense.