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If you just want to donate to disaster relief, you can do so on the Amazon website and the entire amount will go to the American Red Cross (donations over $250 will get receipts for tax purposes). But, if you need a few technical books, today's deal at O'Reilly lets you get them at half price and a portion will go directly to Japan (the American Red Cross fund is for future disasters, with the amount they direct to Japan coming out of past contributions).