What is the significance of 2 million pixels Sony Bravia has highlighted in their newly launched series of LCD TV's?

2 million pixels would obviously be the screen clarity. A regular desktop LCD monitor could come with screen resolutions of about 1280 x 1024 = 1.3 Million pixels (approx.) Therefore a 2 million pixel screen would have a very high quality resolution, about 1536 x 1280 and more.