@Bill,

The data can be retreived using jQuery.ajax method, so you can use the received data object instead of the hardcoded example.

jQuery(function(){
   jQuery.ajax({
      url: '/someJSONService',
      success: function(data){
         $('#clientTemplate').tmpl(data).appendTo('div');
      }
   });
});

You can also send data with ajax and jQuery has some good documentation on how to achieve this. How you set up CRUD services however is kinda outside of scope of this article/jQuery plugin. I suggest setting up RESTfull services and using jQuery.ajax to post requests, there are many articles on the net on this very topic, just do a search ;)