Five Icon Dock - Tweaks the dock of your jailbroken iPhone so that it can fit five icons instead of four.
Winterboard - Give your iPhone or iPod Touch a graphical overhaul!
Cylinder - Sexy homescreen icon animations
Infiniboard - Vertically scroll your home screen pages!
Five Icon Switcher - This puts more icons into the iOS4 multitasking bar, instead of the usual four.
Six Icon Dock - This tweak allows you to have 6 icons in the dock of your jailbroken iPhone.