A quick note for that first tutorial (which is quite good already):

Right up front, you should really be introducing people to the idea of using get() and set() rather than accessing properties directly. From the video (and accompanying text) it's actually not clear why you did that and it's one of the most critical pieces of Ember's "magic sauce." Aside from the data binding itself, it also ties you into things like computed properties and every introduction I've seen simply glosses over these methods. To me, they warrant a reasonable explanation so they don't appear to a newcomer as needless indirection.