I have created this QR code (Quick Response Code) generator using Google's Chart API that dynamically generates a QR code containing the URL of the current page. This is handy if you have a mobile phone with a QR barcode reader. I'm sure if you use Google to search for your mobile phone's make and model with "QR reader Software" that most mobile phones will have an application that can do this. A good place to start looking for a QR application for your mobile phone would be http://www.mobile-barcodes.com/qr-code-software/
If you would like the QR code on your site, paste the following lines between the <body></body>tags of your pages.
<div style="width:230px;height:190px;border:1px solid black;" align="center">
The output from the QR Code Generator looks something like this: