Adding MetaLab's Flow to the examples.

index.html

@@ -1851,6 +1851,19 @@ var DocumentView = Backbone.View.extend({
         <img src="docs/images/basecamp-mobile.png" alt="Basecamp Mobile" class="example_image" />
       </a>
     </div>
+    
+    <p>
+      <a href="http://www.metalabdesign.com/">MetaLab</a> used Backbone.js to create
+      <a href="http://www.getflow.com/">Flow</a>, a task management app for teams. The
+      workspace relies on Backbone.js to construct task views, activities, accounts, 
+      folders, projects, and tags. You can see the internals under <tt>window.Flow</tt>.
+    </p>
+
+    <div style="text-align: center;">
+      <a href="http://www.getflow.com/">
+        <img src="docs/images/flow.png" alt="Flow" class="example_image" />
+      </a>
+    </div>
 
     <p id="examples-tilemill">
       Our fellow