I just thought I would throw in that even though I am a huge advocate for abandoning antiquated versions of browsers, sometimes it cannot be avoided. For example, if the client is oh, say, our fine military, their technology is AT LEAST six months to a year behind. And because of the competitive nature of the business, one simply cannot demand more money to develop for their technology, for the client would just choose the lowest bidder. Thus the importance of being able to develop for all conditions.