While debugging a problem with the showcase remote form page I noticed the following:

I had <ww:action ... action="/RemoteForm.action /> which was failing. The URL being called was "/context//RemoteForm.action.action".

Even though their will be a high chance that a WW action is called, it looks like the action value is assuming that this is always an action. We should ensure that other URL's can be called and not just WW actions.