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Article: HP Says BlackBerry PlayBook Imitates webOS, RIM Responds.
its similar but not the same. I dont think they are copying, if you look at the progression of the UI on BBs its very similar to the formula they have been using for several years now, just look at the page navigation compared to the alt+escape menu. But in the end HP doesnt even care, they think they are being copied but if they had anything other than similarities here and there theyd sue just like all these big companies do.