My Notes has recently passed 2.5 million downloads and just got better with newly added support for Task Lists, Numbered Lists, Shopping Lists and Event tracking.
Besides great note taking support, the added list types are great for tracking grocery lists, ToDo lists, monthly bills or basically any other list you can think of.
The app also has a Windows 8.1 companion app with OneDrive cloud sync that also serves as an online backup.
I especially love the event tracking and live tile support. My kids love seeing the countdowns on the live tiles with number of days left till their birthday, end of school or next vacation. The voice to text support is also great when I need to save a quick note while on the go or text to speech to read back a note or list back to me.