I saw it here:
Watch video and you will see. I want to know how to create this effect on Android Gingerbread.
When i flashed a custom Gingerbread rom, one of the launchers included has this menu style, but again, this includes rooting your phone and doing a data wipe at least once.
Launchers change the app menu style, but i do not know if this one is available without a custom ROM, which will require a root and reflash.
ADW Launcher EX is a replacement Launcher and it has the ability to have the "Application Drawer" in the 3D mode like you described. There is also a free version that may have that option as well, I don't remember if it had it or not.
These can be installed on the device from the android market, and do not require rooting.