Awesome Note is an all-in-one organizer app for iOS 5.1.1 or later. Supports iPhone, iPad, and iPod touch.
Read Awesome Note (+Todo/Calendar) (for iPhone) Review.
A new version Awesome Note2 is available.
Con Backgrounds are girly and corny
You can’t add your own backgrounds, not in the start page neither in the individual entries, so you only have the ones provided and after a while they become boring. They don’t say this in the App Store, so it’s possible to buy it thinking you’ll be able to have personalized backgrounds but no.