--- a/backbone.shard.js	Wed Dec 05 00:36:27 2012 +0900
+++ b/backbone.shard.js	Wed Dec 05 01:27:51 2012 +0900
@@ -41,7 +41,15 @@
 };
 
 _.extend(Backbone.Shard.prototype, Backbone.Events, {
-    initialize: function() {}
+    initialize: function() {},
+    
+    pluck: function(attr) {
+        return _.map(this.models, function(model) { return model.get(attr); });
+    },
+    
+    chain: function () {
+      return _(this.models).chain();
+    }
 });
 
 // Underscore methods that we want to implement on the Shard.