Obviously, there is a problem with the homepage of Ember.
A quick comparaison with sites like angular.js, knockout.js and even backbone.js, give us a hint that a lot of people will have a hard time to figure out basic stuff, like dependencies.
A quick fix would be to link to un up-to-date starter kit (sadly, the latest one include an old version of Ember), mention all the dependencies of the framework (like backbone.js does) and a list of up-to-date resources/tutorials.