I've been interested in playing with QR codes, and how they might be applied to my work at CISTI. Recently, I found a useful tip from Lifehacker showing how to create a bookmarklet that will make a QR code of the current web page... useful if you want to transfer the current page on your desktop/laptop to your phone for mobile reading. It's a lot more convenient than emailing yourself the URL.
It's dead simple, making use of Googles chart API's. Just make a bookmark in your toolbar with the following as the location information: