One thing I've noticed a fair bit around the web is all them firefox buttons. And now WordPress is supporting Browse Happy, we'll see a whole lot of Browse Happy buttons around. All good.
But how about not selling to the converted? If the target market is Internet Explorer users, how about only showing the "Get Firefox" or "Browse Happy" buttons to them, since the ones using a non-IE browser have already been converted and are 'browsing happily'? =)
And it's possible - using IE's proprietary conditional statements, we can make it so only IE users see the message, and those converted can live free. The only thing I'm not sure about is the XHTML validity of the statements, but since they're technically comments it should ignore it.
Basically, it would be formatted something like:
<!--if [gte IE 5]
// put Browse Happy/Get Firefox image or text here