@staringispolite has created a simple, open source way that you can help drive the IE6 demon out of our Internet. The Google Code project is called, aptly enough, sevenup. It's inspired by both Google's effort and the movement started by a group of Norweigan websites.
Sure, you could do this on your own from scratch, but sevenup is ready to use and easy to integrate. Do your part to save less tech-savvy web surfers from their browser!