For the last few months I've seen some aggressive campaigning to rid the online world of Internet Explorer 6. Many web developers and designers have been supporting this browser for what seems like forever, and now that IE6 is losing market shares fast, it seems like a good time to make the final push to kill it.
While I whole-heartedly agree that we'll all be better off without IE6, I don't agree with providing zero support for the browser. Let's face it, the whole "browser X is outdated" thing isn't new and will always be here to haunt us -- remember Netscape 4?
I don't mind providing users with a nice message about why they should upgrade their browsers, as long as it doesn't obstruct workflow, and they need to have an option to never be bugged again. But please, please do not do something stupid like the #ie6update script. It's wrong on many levels, and there is a good post on why it's wrong.
The best way to approach older browsers, I think, is to use to use graceful degradation (older concept) or progressive enhancement (better). With the latter approach, you design your website for the lowest common denominator and progressively enhance it to improve user experience for newer, more advanced browsers. Of course, while PE sounds nice in theory, it does require a fair amount of discipline in practice.
There is also a JS library for detecting different browsers and operating systems. While I don't personally like this approach, it may be cleaner than writing a lot of IE CSS hacks. Maybe.