Self Updating Visiting Cards

Visiting vards are a popular way of exchanging contact details.But they become useless if the person changes his contact details.
If there can be visiting cards that update the contact information every time the user changes it, life would be a lot more easier.
Such cards are not hard to make. It can have a simple magnetic stripe or a very small chip that will store all the information just like credit cards. There can be a gadget connected to internet just like swipe machines we see at shopping counters that downloads and updates the information on cards from either a centralised database that contains all the information that users upload about themselves or even social networking sites like Facebook, Myspace, Orkut etc.
The contact information can be made restricted according to user preferences.

Though it seems like streching the idea too much, those cards can also be made Wireless net enables themselves
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