Rats! My Twitter app died!

Wanted to post this and see if anybody had any insight. In beta 1, the app was able to grab a feed from Twemes.com and display it, with beta 2, it no longer appears to get the data. The app is up at www.toysfortweets.com/teched08.
The code that grabbed the RSS before looked like this:
 HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(new Uri("http://twemes.com/TechEd.rss"));
 request.BeginGetResponse(new AsyncCallback(responseHandler), request);
 void responseHandler(IAsyncResult asyncResult)
        {
            // Get HTTP response
            HttpWebRequest request = (HttpWebRequest)asyncResult.AsyncState;
            HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asyncResult);
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