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OneNote (Metro app)
OneNote users should pick up the app in the Windows Store for good touch handling of your OneNote notebooks. It is particularly good for inking should your tablet have a pen.
Note there are two different OneNote apps on Windows 8. This app is a full Metro (or ModernUI) app and there is another that is part of Office 2013 that is a desktop app. You can have both versions installed on the same system and use them as desired.
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.