Springtomize - Tear down the walls
Cylinder - Sexy homescreen icon animations
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.
Transparent Screen Lock - Password protect your workstation or server with "Transparent Screen Lock" while monitoring programs that are running.
Infiniboard - Vertically scroll your home screen pages!