Pop doesn't have any example code yet so I created a video tutorial to help folks get started (with source code): http://tapity.com/tutorial-getting-started-with-pop/
Thank you for introducing me to Origami! My time on HN today was not wasted.
(It's at https://facebook.github.io/origami/ if somebody else reading this also did not know about it.)
I started a little example project too. So far, I have some sliders that let you play with the decay animation.
https://github.com/callmeed/pop-playground
If anyone wants to help, drop me an email.
That said, I still have a hard time seeing how Pop is much different than iOS 7's animate with springs API.