Cool new Jelly Bean feature
So I'm skimming the [Only registered and activated users can see links. Click Here To Register...] that discusses the new features for Jelly Bean and learned that I can now use the S Pen to hand write things on the S Planner. (Scroll to Enhanced Handwriting)
Only works in landscape mode, month view.
With this view displayed, click the options (three horizontal lines) in upper right corner.
Choose "Enable Handwriting mode"
Write, circle, doodle or otherwise mark up your calendar.
If you return to the options and choose "Disable Handwriting mode" your writing disappears, but if you reenable it, it returns.