Here is Samsungs dead pixel policy from their website relating to LCD TV's. I found a bunch of articles about a zero policy back in Jan '05 but I guess they don't have that anymore.
What Is Your Policy On Defective Pixels?
One or two dead pixels out of the approximately 300,000 to 1.3 million pixels on a typical LCD television is normal. Generally, then, if you have only a few dead pixels, service is not an option.
With that said, what we do about an LCD TV with dead pixels depends on:
The number of dead pixels
The location of the dead pixels
The color of the dead pixels
The size of the LCD TV screen
If you are having a serious problem with dead pixels, gather the information listed above and call Samsung Customer Care at 1-800-Samsung (1-800-726-7864). Have the model number and serial number of your TV on hand when you call.