Why?
Enough is enough. Microsoft Internet Explorer 6 was released in late 2001. For its time, it was a decent browser, but in 2009, it is still in use by a significant portion of the web population, and its time is now up.

As any web developer will tell you, working with IE 6 is one of the most difficult and frustrating things they have to deal with on a daily basis, taking up a disproportionate amount of their time. Beyond that, IE 6′s support for modern web standards is very lacking, restricting what developers can create and holding the web back.

What?
This website is run by a group of people who want to see IE 6 disappear as soon as possible. To help make that happen, we’re encouraging the IE 6 users of our websites to upgrade to a more modern browser, so they can have a better experience using our sites and browsing the web.

This site has examples for various platforms to display a banner to IE6 users to encourage them to get up to date. Code examples are available directly here