Nikon has issued a statement about the impact of the earthquake on their operations. Bottom line: there was damage to some equipment and buildings, some employees have been injured, and it is unclear when they'll be able to resume full production at their affected facilities. Note that plants referred to in the statement include those that make the D700, D3s, D3x (Sendai), and lenses that are labeled Made in Japan (Tochigi).
Other camera and tech companies that have plants in Northern Japan have issued similar statements. Panasonic, Sony, Canon, Fujifilm, and Sigma all have factories that are likely going to be affected by Friday's quake and tsunami, and power infrastructure in Northern Japan will be compromised significantly with so many nuclear plants shut down and power lines down.
At least two and possibly more of those nuclear plants will never reopen: once you choose to use sea water for cooling you contaminate the containments in ways that preclude you ever using the reactor core again. While news outlets are playing up the radiation potential, anyone with knowledge of BWR plants like Fujushima will recognize the bigger long-term issue is the total loss of the plant itself for power generation. Nuclear plants in Japan had been producing about 30% of the electricity (source: World Nuclear Association). It's unclear at the moment just how much of that generation has been shut down, and for how long, which is one reason why so many companies are citing power as one of the unknowns in terms of resuming future operations.
(commentary) Again, our first concern and thoughts are for the people of Japan, especially those in the hardest hit areas of the Tohoku region. When it becomes clearer how those of us outside of Japan can best help those people, I'll post information about that. Right now it is still early in what will be a very long-term crisis and rebuilding effort, and thus it is unclear what the best and most effective way to help will be. That's especially true if you want to direct your contributions towards specific areas, like Sendai (though Salvation Army has indicated that they are targeting this area).
From a more pragmatic and very impersonal standpoint, there is almost certainly going to be disruption to supply of camera and other high-tech equipment worldwide. For how long, and by how much, is very unclear at the moment, though I'm certain that the companies involved will be working their hardest to minimize that. But if you need a particular product and it is available now, I wouldn't hold off on purchasing it. In a very small way, that would tend to help the company and people who produced it recover by clearing inventory and increasing demand at the plants as they reopen.
Personally, I'm deeply saddened by the tragedy that's unfolded. I've been in contact with many of my friends in Japan, and they all appear to be fine, but this is one of those once-in-a-lifetime, never-forget events for them. I've visited some of the places that now no longer exist, and I remember them as being amongst the most quaint and pleasant I've encountered, mostly due to the people. I feel the pain they're experiencing. I think anyone that's human feels that pain. Let's all send our best thoughts and wishes to those in Japan along with our hopes for a better future for all.