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Yesterday, comparison photos and the world's first sneak peek of the Nexus One (aka Google Phone) hit the web, offering the first chance to see just how it stacks up to the iPhone as far as the interface's experience. Today, Engadget filled in the rest of the blanks, publishing an extensive specification sheet on the device that shows us how it really stacks up to the competition today. They also have word that the device will first be sold on an invite-only basis.