One very nifty feature of FubuMVC is the automatic binding of request properties to your input model. From what I can tell, any item in the AspNetAgregateDictionary will be bound if the name/type of your input model property match. So for example, the following input model would have the user agent bound to the UserAgent property, talk about loose coupling:

public class InputModel
{
    public string UserAgent { get; set; }
}