Winterboard - Give your iPhone or iPod Touch a graphical overhaul!
Five Icon Dock - Tweaks the dock of your jailbroken iPhone so that it can fit five icons instead of four.
Cylinder - Sexy homescreen icon animations
Dreamboard - DreamBoard lets you take control over the homescreen of your jailbroken iPhone.
Pirni Pro - A page about iPhone Software.
Five Icon Switcher - This puts more icons into the iOS4 multitasking bar, instead of the usual four.