SpringBoard Rotator is a new Cydia app for iPhone 3GS that will be released soon. This iPhone tweak app completely rotates Springboard so that the iPhone automatically adjusts for portrait or landscape mode.
Unlike other iPhone apps, where they only rotate the icons or the like, SpringBoard Rotator is able to manipulate the entire graphical interface of the iPhone. Also using 5 icon dock and Shrink to reduce the size of icons, you can get really nice effects and also similar to iPad. Currently, SpringBoard Rotator works on iPhone 3GS only.