What is that barcode on the sidebar?
This is a 2d barcode, also known as a QR Code. It is a way of delivering information to a mobile phone or other device equipped with a camera and a code reader.
Check out more about the QR code reader here:

Image to get to http://en.m.wikipedia.org/wiki/QR_Code
Get the reader here

Image to get to http://i-nigma.mobi
