Five Icon Dock - Tweaks the dock of your jailbroken iPhone so that it can fit five icons instead of four.
Springtomize - Tear down the walls
Winterboard - Give your iPhone or iPod Touch a graphical overhaul!
Iconoclasm - Iconoclasm is a tweak that lets you break the barriers of what you can do with the app icons of...
Cylinder - Sexy homescreen icon animations
Five Icon Switcher - This puts more icons into the iOS4 multitasking bar, instead of the usual four.