Here are some inspiring experiments using Apple Pencil for image processing, audio synthesis and electronic scale.

• Image Processing with PencilController: http://flexmonkey.blogspot.co.uk/2015/11/pencilcontroller-using-apple-pencil-as.html
  
• PencilSynth – An Apple Pencil Controlled Synthesiser: http://flexmonkey.blogspot.co.uk/2015/11/pencilsynth-apple-pencil-controlled.html
  
• PencilScale – Using an Apple Pencil with an iPad Pro as an Electronic Scale  http://flexmonkey.blogspot.com/2015/11/pencilscale-using-apple-pencil-with.html
  

First impression of Apple Pencil

Surface Pro 4 Pen vs. Apple Pencil

Benchmark:

Another comparison between iPad Pro and Wacom Cintiq

Another interesting video from Steve Jobs – “Who wants a stylus”

And finally, enjoy the full iPhone 2007 presentation: