Of course, since it’s a Microsoft-sponsored campaign, it’s only promoting upgrades, rather than promoting an upgrade-or-switch message.
Static HTML points out why you might want to put your effort into some other campaign instead. Because IE6 Countdown is only an upgrade campaign, and IE6 users are all on Windows XP or below (Vista ships with IE7), they can only ever upgrade as far as IE8. Given the huge gap between IE8 and IE9 in terms of standards support, HTML5, CSS3, and so forth, IE8 will soon become the new millstone around the web’s neck.
So instead of plugging IE, consider plugging your own favorite browser, be it Firefox, Chrome or Opera. Or perhaps plug another switch campaign. After all, there are quite a few alternative web browsers out there!