textly maybe a bit too minimal for some, but if you're looking for the digital equivalent of a scrap of paper, with no extraneous add-ons then this is the app for you. There's always a certain elegance in simplcity, which is the reason that textly caught our eye.
If you're looking for something more fully featured then there are lots of option available for Windows Phone, including the built in OneNote app, and third party apps like Evernote, Papyrus, and Note+.
Windows Phone Store description:
textly lets you write like you did when all you had was a blank piece of paper and a pencil.
Capture brain-hogging ideas and brilliant moments that take your breath away, journal your day, draft a blog post, share what you learn, see or experience or simply note down addresses, names, grocery lists, tasks or the phone number of the girl you just met.
textly is a free download from the Windows Phone Store