The process is quite simple. Begin by logging into Windows Live SkyDrive (readers note that non-English users might need to change their language before continuing). Then upload at least one Office document to your SkyDrive's Documents/My Documents folder, which should present a "Join our preview program" link. Naturally, click on that, accept the license agreement and voilą, the Office Web Apps Technical Preview will be enabled.
Mileage seems to vary based on user feedback, but give it a shot and let us know how it goes. Head over to LiveSide for a detailed step-by-step post with images.
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