I found this project on the blog of wordpress theme author Neoease. A simple script that you can reference on your website website, which will show the above notification to anyone who visits your site using IE6. Lets all join him in banishing IE6 from the world!
Just add the following code within your <body> tags
<!--[if lte IE 6]> <script src="http://letskillie6.googlecode.com/svn/trunk/letskillie6.pack.js"></script> <![endif]-->