Inspired by the vertical scrolling functionality on Android handsets like the Nexus One, InfiniBoard allows users to vertically scroll through their SpringBoard icons. The application integrates with the built-in horizontal scrolling functionality thus providing a two-dimensional navigation feature on your SpringBoard.
However, there are a few issues waiting to be resolved. Though the InfiniBoard application includes support to OverBoard; an application that brings Mac's Exposé feature to the iPhone, the icons are currently hidden and are expected to show up only after a new update is released for OverBoard. Also, users who have Categories app installed may notice that vertical scrolling does not work inside a particular folder. These are expected to be fixed in the next few days.
InfiniBoard is available from the BigBoss repo on Cydia for $1.99.