Here is a good example of a reason to create browser independent, gracefully degrading websites! I have frequently told people ‘Even future versions of Internet Explorer will not produce the same results for the pages you are building for IE today!’. (To put this in context: it is a response to those people who think they only have to make their websites work with the most recent version of Internet Explorer.) This announcement talks about changes that will change the user experience of certain websites for people ‘upgrading’ to upcoming versions of Internet Explorer for Windows. This FAQ page tries to answer how websites will be affected and what website developers will have to do to keep providing a good User Experience.

http://developer.apple.com/internet/ieembedfaq.html