I’ve coded a QR Code Generator widget for Mac, which as usual can be downloaded from my downloads page. Basically it uses the Google Chart Tools to turn any string in to a QR code. You can use it to encode URLs, vCards or well, anything you want. The resulting QR Code is ready to be scanned by any mobile device with a camera & decoding software.
I realize not everyone is using Mac OS X, so I’ve included a plain old HTML / Javascript version in this post ↓