Touch Tweets is an official example app created by Sencha Inc. for Sencha Touch 2. You can find Touch Tweets by clicking the green HTML5 app link to the right, and the entire source code is available when you download the mobile framework.
Built with Sencha Touch.
Sencha Touch is the leading HTML5 mobile framework. It allows you to develop mobile web apps that look and feel native on Apple iPhone, Google Android, and BlackBerry touch devices.