Coming from asp.net MVC 3. In MVC4 they introduced WebAPI\'s. It would be nice to be able to do all view/routes code in javascript and just rely on MVC for API. Heck it\'
I've used PathJs with some success, there is also Sammy which is more of a framework. Neither of these are KO specific.
A more heavyweight but KO optimized solution would be Knockback.
Hope this helps.