I use a keyboard in the dark all the time, actually. And, despite what your mother told you, there's no evidence that using your eyes in the dark is bad for them. That's just what she told you to prevent you from watching too much TV.
Why this keyboard is groovy (The short version): The keyboard is the key-reference.
Why this keyboard is groovy (The long version): Now, as for THIS keyboard, the point isn't that the keys are backlit or anything like that. The point is that youcna specify what the keycaps are dynamically. Anyone who has ever played Falcon4 or LOMAC, or have used programs like Lightwave (which uses raw keystrokes for input) can attest: some programs just use a metric assload for keys. Assigning keycaps lowers the learning curve in programs signifigantly. No more "i want to target the nearest enemy. that's assigned to 'w', so I'll push 'w'." Instead its "I want to target the nearest enemy. I'll hit the 'nearest enemy key'". That's a lot of save thought cycles. In something like Lightwave, it could just save you hours. No more searching for the right keystroke to bridge the span between two polies. You just hit the damn 'BRIDGE POLYS' button.