One of the tips that Richard shared was using the URL shortner http://goo.gl One of the handy features of that service is that it automatically creates a QR Code for the site
This got me thinking about other ways to accomplish this and how to easily generate QR Codes that others can use. So I put together a Google Form QR Code Generator.
You can copy and paste addresses into the form, refresh the page and see the results below. The QR image can then be downloaded and shared.
You can check out an example of what it would look like embedded into a site here: