Neuratron has come out with a new notation software, NotateMe, for iPad, iPhone and Android. It is constructed so that you can WRITE the notes using your finger or a stylus, and it will convert your written score in to notation that can then be sent to Sibelius or Finale. You can even create a full orchestral score!
Copying and Pasting? Yup!
I've just started using it, so it's still learning my writing style, but I've gotta say, THIS IS COOL!
I would recommend getting a decent stylus, such as the Adonit Jot, as opposed to the cheap £2 stylus I am currently using. Granted, the latter works ok, as does your finger.