I love QR (Quick Response) Codes, my favorite way to use them now is as a method to send data, mainly links and text to my smart phone. I know there are a thousand and one ways to do this but I love the simplicity of just using the Mobile Barcoder extension for Firefox and the QR Droid app for Android.
You just highlight text or a link and right click and select “Create barcode from link” in the menu. Then it generates the QR Code, I then just use the QR Droid to capture it. I use this mainly if I want to read something on the go or send some quote that I then can send as text message. Bellow is a QR Code for the QR Droid app for the Android.