SaveTheDevelopers.org places a friendly popup request for IE6 users to upgrade their browsers. (via TechCrunch)
By placing a simple conditional comment with a .js script in your page.tpl.php, visitors using the outdated and buggy IE6 web browser will see a small roll-down on the top of their browsers, "nagging" them to upgrade. After clicking the roll-down, a new browser window opens with links to other recommended browsers: