Ember

Avoid using $ without scoping to this.$ in views and components.
Prefer to make model lookup calls in routes instead of controllers (find, findAll, etc.).
Prefer adding properties to controllers instead of models.
Don't use jQuery outside of views and components.
Prefer to use predefined Ember.computed.* functions when possible.
Use href="#" for links that have an action.
Prefer dependency injection through Ember.inject over initializers, globals on window, or namespaces. (sample)
Prefer sub-routes over maintaining state.
Prefer explicit setting of boolean properties over toggleProperty.
Prefer testing your application with QUnit.

Testing

Prefer findWithAssert over find when fetching an element you expect to exist