Nice to see a thing on HN a few days after learning it. (Feeling like a hipster, nomen omen. :))

This link (from the official IPython site) is great at explaining interactive widgets: http://nbviewer.ipython.org/github/ipython/ipython/blob/mast...

Also, one more nice example I've found is there: http://earthpy.org/pyncview_pm.html