InfiniDock is a remarkable Dock Icon Scrolling Jailbreak Application which allows you to add infinite number of applications in your Dock as shortcut. Normally iPhone and iPod Dock is restricted to have maximum of 4 applications but with InfiniDock you can add any number of Applications you like and you can scroll left or right to browse them.
InfiniDock is must for those iPhone or iPod users who have a large number of applications and thereby browsing to each application takes time so you can place your mostly used application or games in Dock.
Chpwn has this to say about his InfiniDock Application,
Full dock customization: scrolling, adjustable icon amounts, and more! Add as many icons as you want, and the dock will grow to accommodate them, and set how many you want on every page. The ultimate dock customization tool, by one of the developers of ProSwitcher. Please report all bugs and submit all feature requests via email so we can take a look!
InfiniDock is paid application for 0.99 US$ however you can try it using the procedure here from xSellize repo.
In order to enjoy such tweaks you need to Jailbreak so you might like to see Redsn0w Jailbreak & JailbreakMe or to Jailbreak while preserving your baseband (software unlock) see TinyUmbrella, SnowBreeze & PwnageTool.
For more stuff check out our Jailbreak Apps & Tweaks Gallery for iPhone/iPod, Themes Gallery for iPhone/iPod,Games Gallary for iPhone/iPod & Appstore Apps Gallery for iPhone/iPod.