TrustedReviews have looked at the Logitech G15 Gaming Keyboard

It's quite big, due to the extended set of keys on the left (more on that later). All of the keys are actually transparent, and then painted in black, leaving the characters transparent, so the light from the blue LEDs underneath shines through, like Saitek first did with its Eclipse keyboard last year. However, it suffers from the same problem as the Saitek in that when you reboot your PC the keyboard light defaults to on. I generally only need the light on when I'm gaming in the dark, so I would have preferred a setting to do this.

Logitech G15 Gaming Keyboard Review