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Tablets are the perfect form for supporting handwritten input, and Windows 8 is easily the best platform for such support. Pen input has been available in Windows for over a decade, and Windows 8 leverages it fully.
Certain apps like OneNote and Windows Journal work particularly well with the pen but it's not limited to those. The onscreen keyboard used in Windows 8 for touch entry can be switched to handwritten entry on tablets with a pen. The automatic text recognition can understand even poor handwriting for entry as text.