BranimirIvanov

Qr Code Adv generates automatically QR code of your current page or home page and displays it in your sidebar. After installing Qr Code Adv you have to go into wp-admin/widgets.php and drag and drop our plugin Qr Code Adv into your sidebar. Thats it!
There are few options for advanced users to customize QR code design (Qr Code color, background color, title etc)
For experienced QR code advertisers there is an option to input QR Code Raw Data that will allow you to make your code do anything you want (create sms, create email, call some number etc)

Qr Code Adv

Qr code widget plugin for your WordPress sidebar. Qr code Adv displays QR codes of your site or any other external URL

Bainternet

With This Plugin you Easily insert QR codes in your blog, with Widget or Shortcode. 
the plugin add a tinymce button so even the shortcode can be inserted for you.
Main features:
<ul>
<li>Very easy to use.</li>
<li>TinyMCE button for easy shortcode insertion.</li>
<li>built-in Widget.</li>
<li>Use as shortcode.</li>
<li>Use as template tag for easy integration with your theme or plugin.</li>
</ul>
any Feedback is Welcome.
check out my <a href="http://en.bainternet.info/category/plugins" rel="nofollow ugc">other plugins</a>

Simple QR Code

With This Plugin you Easily insert QR codes in your blog, with Widget or Shortcode.

Qr Code Adv vs Simple QR Code