KApp (Killing Application) is a lightweight PHP and javascript file that you include on every page of your website to discourage use of IE6. If a user is browsing with IE6 on a site with KApp installed, an alert appears. Upon clicking on the alert it will display a small explanation of why IE6 is so bad and a link to instructions for downloading a new one. This is very useful if your website is broken in IE6 and you don't want to fix it. You can view a demo of KApp here. (But remember, it's not going to show anything unless your using IE6)
You can download KApp free of any license restrictions here. (Although I would appreciate it if you kept the link to my site) Installation instructions are in the readme.txt file. Enjoy!