This actually works! The viewing angle can be improved significantly on the gTablet pretty easily. I did this by simply applying a Skinomi screen protector. (Similar material to the BestSkinsEver protectors, but BSE doesn't make a gTab one yet.) I got mine with the carbon fiber skin, which is textured and cool. But the screen protector prevents the color inversion that I saw maybe 30-40 gegrees below vertical in landscape mode. The screen is generally brighter/clearer over a wider range of angles with the screen protector on. I had read this a few places, and it really works, makes the gTab much easier to use.
Another minor tip for more brightness is to flip the tablet upside down (in landscape mode). For apps that auto-rotate, the brightness is better when viewing the screen upside down.
Another minor tip for more brightness is to flip the tablet upside down (in landscape mode). For apps that auto-rotate, the brightness is better when viewing the screen upside down.