Nice Article. I went for Dynamat.. bit costly..but, I never regret.
check this: http://acousticsforyou.com/articles/2007/12/do-you-hear-rattling-sound.html
check the link below... I doubt it it works out in India..
Nice technology....but, Its too costly ya...
http://acousticsforyou.com/news/2008/01/in-car-satellite-tv-in-india.html