2d bar codes

Have you ever seen this 2D bar codes?
Now you can to to 2d sense and create a free account.
You can download a free app for your iphone and start creating links and 2d bar codes, that when you take a photo with your iphone triggers an action: going to a map, sending email, dialing a number, going to a web… you name it.
This is the bar code for this blog.