I think that business cards are a waste of paper. People mostly communicate via email nowadays, so just writing down someone's email is good enough. Or just take it down on your cellphone's text interface.
Disclosure: I do have my own cards which I printed last year using DIY software on my own cardstock. BUT, I probably have more business cards of other people that I have collected over the years. Those are really of no big use. Nada, zip.
