SPB Mobile Shell, is an interface app for Windows Mobile that has layouts for both lifestyle and professional users which can run either simultaneously or individually. The new release added many new widgets, including social networking, wireless settings, and Internet search. In addition to UI shifting to portrait/landscape screen when the phone is tilted, SPB Mobile Shell lets a phone's velocity sensor control the UI in three dimensions. It's somewhat like HTC's TouchFLO 3D Windows Mobile interface, except far more 3D. It’s compatible with Windows Mobile 5 (Phone, Pocket PC,) WM6 (Classic, Professional) and WM6.1 (Classic, Professional).
More info: SPB Mobile Shell