QR code for your business card

Donna Svei writes about using Pingtags to generate a QR code for your business card:

Pingtags signs you in via LinkedIn in seconds and then creates a QR code for you. The code gives those who scan it the ability to:

1. See your LinkedIn photo without entering your LinkedIn URL.
2. Read your LinkedIn summary without entering your LinkedIn URL.
3. Ping you via email with their LinkedIn URL so you can see their profile and connect with them.
4. Email you without entering your email address.
5. Call you without entering your phone number.
6. View your blog and other LinkedIn web links without entering any URLs.

My QR Code using this Pingtag service is as follows:

Have you used a QR code?

How did it work for you?