An interesting article on techcrunch about how to deal with exchanging contact information when meeting new people.
Gregory Ferenstein from Techcrunch proposes to simply send an eMail to the person you just met to transmit your contact information. And with www.vicarda.com you will be able to transform this signature-information into a vCard for your address-book easily.
Other methods include
So, as people are different, also different forms of transmitting contact details evolve.