Hidden is a new Simplenote app that looks and feels a lot like regular Simplenote, except that any note you begin with an underscore is hidden from view, stored in a separate hidden area of the app and can be passcode protected. This is rather nice, I have a few notes that I would rather not be accessible to everyone. I downloaded it last night I like it so far, they say an iPad version is coming and that it will make the app universal, meaning you only have to pay $1.99 once.
Very neat app.