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Windows 8 has emoticons -- enough said, really? Though the emoticons do not work very well in applications such as Notepad, these would be ideal for instant messaging and even Facebook.
But the best thing about this keyboard is that it can go into 'thumb' mode, allowing the user to hold the tablet in both hands and use their thumbs to type with. iOS 5 and iPads will have this functionality also, but it's nice to see Microsoft keeping ahead with the times.