You met someone in a networking event; you exchange business cards; next thing you know, you get all kinds of emails, phone calls, mail - what did you just do? Congratulations, someone is making money on your bizcard.
Check this Blog - http://www.techcrunch.com/2006/03/23/jigsaw-is-a-really-really-bad-idea/
The idea is creepy and insane and swear you will never handout your business card.
Not only Jigsaw is selling your information to it's members, you made it to the list generation, so heavy duty marketing is coming in your way - Watch this new Jigsaw list building - http://myjigsawdata.com/jigsaw_lists_webinar.html
BTW, I had an account too, I was excited when I found this, once you get the sense of how cheap it is, you wonder, if you ever want to carry your business cards.
Is this ethical? Legal?