ASE Labs posted a review on the Logitech G15 Gaming Keyboard

The keyboard contains the extra programmable keys on the left but also contains many more features that set this keyboard apart from other keyboards. There is a lack of extra keys. Those are what I call the "BS" keys such as email and homepage keys or other sort of quick launch buttons. It makes the keyboard look too cluttered. In the center located at the top left is the Windows key disable switch which is VERY useful for a gaming keyboard. No need to pop off your keys if you keep hitting the Windows key. This switch is hardwired and does not require software. There is a mute button and a backlight button on the top right and both do not need software to function.

Logitech G15 Gaming Keyboard Review