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Owners of the Tablet PC of the past are no doubt familiar with Windows Journal and its great handling of ink input. New Windows 8 tablet owners should be happy to note that the Journal is still here and works the same.
This is actually a desktop app and not a Metro app but it works well and a good method for taking ink notes.
Windows Journal -- Free (preinstalled)
If you like simple text editors you should check out Notepad Classic. It is a good way to edit text without worrying about formatting which gums up your plain text content.
I often use this app to enter text for copying to other apps which works very well.
Twitter users may find Rowi to be just what they are looking for in a Twitter app. The interface is atractive and very touch-friendly for typical Twitter access.
This is not my favorite way to work with Twitter but many like Rowi.