A quick hands on with this one, Antec released HDTV Bias Lighting Kit last week.
You know when you have that new huge 55" LED TV and in the evening when it gets dark you can see a little LED wash / clouding on the black screen. It is a common problem these days.
Some people are very bothered by it, other not at all. It is a problem that can be fixed to a large extent by placing or pointing a light behind the screen. The visuals will change dramatically as your eyes will compensate that black level and contrast. This actually is the reason why Philips has released Ambi-light TVs initially.
Antec has a very simple solution at hand for roughly 30 USD/EUR, they took some of the brightest LEDs they could find, connect it towards the USB port of your television and when you power on, you have light. An adhesive coating on the LED strip will make it stick towards the back of the television. The LEDs will power up and down with activation of the HDTV, but should you wish to deactivate the LEDs, you can simply turn it off with an convenient on/off switch.