I have discovered a new use for my smartpen!
Stuck in the car with nothing but the pen and a notebook, I turned on the radio and was struck with inspiration. When the next song started I hit record on the pen and drew a little triangle, a circle around it, and then wrote the title of the song. When the song was done recording I stopped recording.
Now, if I ever want to listen to that song on my pen, I just have touch that little "Play" symbol I drew when the song began. One can develop quite the song collection!