Eclipse is a WordPress theme by CyberChimps that includes a Responsive Design that responds automatically to mobile devices such as the iPhone, iPad, and Android.
Eclipse also includes Drag and Drop Elements such as the Portfolio Element, Responsive Feature Slider, Page Content, Twitter bar and Widgetized boxes. All of which can be used on a per-page basis using Drag and Drop Page Options that also include sidebar and layout options giving you the power to control the look and feel of every page of your website.
Download: http://wordpress.org/extend/themes/eclipse