Five Icon Dock - Tweaks the dock of your jailbroken iPhone so that it can fit five icons instead of four.
Infiniboard - Vertically scroll your home screen pages!
Winterboard - Give your iPhone or iPod Touch a graphical overhaul!
Infinidock - Infinidock is the ultimate dock customization tool for jailbroken iOS devices.
Cylinder - Sexy homescreen icon animations
Five Icon Switcher - This puts more icons into the iOS4 multitasking bar, instead of the usual four.