Transparent Screen Lock - Password protect your workstation or server with "Transparent Screen Lock" while monitoring programs that are running.
Cylinder - Sexy homescreen icon animations
ClearLock - A transparent screen locker.
Springtomize - Tear down the walls
BlueLife KeyFreeze - FREE Windows application that blocks your keyboard and mouse without “locking” the screen.
Five Icon Switcher - This puts more icons into the iOS4 multitasking bar, instead of the usual four.