Springtomize - Tear down the walls
Cydia - An alternative app store for jailbroken devices.
Five Icon Dock - Tweaks the dock of your jailbroken iPhone so that it can fit five icons instead of four.
JazzMyApp - Let JazzMyApp surprise you with amazing apps everyday. Try it out yourself.
Cylinder - Sexy homescreen icon animations
Fnd - Browse Apple App Store and iTunes on the Web