A lot of sites have a “Get Firefox” banner on their site these days, but Dan Ostermeyer has a way to target IE users specifically by using IE’s own technology against itself. Apparently there is some sort of proprietary comment code built-in to IE, and since only IE recognizes it, you can put your promotion wording in there and only IE users will see it. Of course there are dozens of other ways to do this like CSS, server side code, javascript, etc. But this isn’t a bad method either. One major problem is that it doesn’t allow your site to validate, so if you are really into seeing that little “Congratulations” message when you validate your site, you may want to use one of the other methods.