In deciding which client side MVC framework to choose, it's enlightening to look at the Github stats for the main contenders: Angular, Ember and Backbone/ Marionette. My main goal was to try to ascertain community momentum & relative maturity of these solutions.
By looking at the above, Ember also has some pretty good velocity and set of core contributors.
Backbone & Marionette
For Backbone, I needed to ...
Note: Marco Polo has been sold to Libera Inc. and I will no longer be developing the Marco Polo app. I'm very excited to see what they will do with it! (2 May 2013.)
Original post (29 Oct 2011) follows: