Sencha Touch does not seem to fully load up on iOS (but works fine on my Android devices). Here's a few examples of namespaces that are undefined:
Ext.Msg
Ext.Viewport
Ext.plugin

I'm using Sencha Touch 2.1.0 commercial (Build date: 2012-11-05 22:31:29, 08c91901ae8449841ff23e5d3fb404d6128d3b0b) and PhoneGap 2.1.0.

The following is a super simple template that can be used to recreate the issue. I used weinre to inspect the app.

Code:
<!DOCTYPE HTML>
<head>
  <script type="text/javascript" src="./sencha-touch-all.js"></script>
  <script src="http://localhost:8080/target/target-script-min.js#anonymous">
    <!-- weinre -->
  </script>
  <link rel="stylesheet" type="text/css" href="./sencha-touch.css">
</head>
<body>
</body>
</html>
Anyone else experiencing this behavior? Thanks,

RS