Magn QR Code for WP
Magn QR Code for WP is a WordPress plugin that helps you to add QR Code or 2D Quick Response code into WordPress posts.
This plugin uses Google Chart API to generate the 2D QR Code image and then you can embed it into WP posts using a shortcode.
or you can use this in your template:
If you want to see this plugin in action you can visit http://aplicaciones.org/