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You can access the iTunes donation page [iTunes link] using the direct link or by clicking on the graphic on the main iTunes page. Denominations range from $5.00 to $200.00 and come out of your iTunes account. One hundred percent of the donation will go to the Red Cross. Because you will be donating anonymously, if you need a receipt or further acknowledgment, check your iTunes e-mail account for your receipt.
Google has already donated $1 million to ground support in Haiti, and other tech giants are also stepping up to the plate.