I'll add a 7th approach: Develop for other browsers, then do the bare minimum needed to make your site usable in IE6. And then explain why you are doing that.

I'll add a 7th approach: Develop for other browsers, then do the bare minimum needed to make your site usable in IE6. And then explain why you are doing that. This achieves the dual goal of exerting pressure on users still using IE6 to upgrade, while not overly inconveniencing those who don't (or cannot). (As an aside, a major Australian accounting firm - I'm talking Big 4 here - only rolled out their upgrade _today_ from IE6 to IE7 - so IE6 is still out there in the corporate world.)