Marco

This plugin will display a QR code in your sidebar which you can easily scan with your handphone or tablet and read later on the way home, to office or to school.

QR code generator

This plugin will display a QR code of the actually loaded page in your sidebar.

Julian M.

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.
[qrcode href=””]
or you can use this in your template:
If you want to see this plugin in action you can visit http://aplicaciones.org/

QR code generator vs Magn QR Code for WP