Reseting the model

Craig,
Again, this is probably a bit off topic since it's not directly related to the future of cairngorm. However, this is, I think, a cairngorm implementation question that may be worth talking about here, since it's related to the highly misunderstood Model layer of the framework.

First, I think you should think about your ModelLocator as a way to access your application Model(s), not the Model itself. Having seperate business and presentation models, you may encapsulate your own initialization logic which can then be invoked regardless of your ModelLocator implementation.

In your example, you can have a LogOutCommand which invokes the concerned model(s) and call the initialization methods, or simply reinstantiate it.

navigateToUrl( new UrlRequest('/') );//or where ever your app lives