Claimer: None of the information you submit above is saved or stored. Check out the source code and see for yourself - there are no databases involved, only Google's Visualisation API. You will not be added to any contact lists for using this service, nor will you have to worry about what might happen if this site gets hacked.
Note: The less information you add to your QRcode business card the easier it will be for other phones to read. Consider carefully what is crucial for your networking goals.