Now considering that one of the aims of this is to provide citizens access to services like Rural Employment Guarantee Scheme (for people below poverty line), I wonder whether this is a move towards the social security structure of USA. My understanding of social security in US, and I might be technically wrong, is that the government promises to give employment, medical care, housing to all its citizens; and in this way, UID sounds similar.
One good thing about the implementations in India: Infosys co-founder Nandan Nilekani has been made head of the agency for implementing UID.
PS: Junta in US, did you know that SSN is not mandatory. People can opt out if they want to. Read more about this at the Wikipedia entry on SSN.