All this talk about IE usage numbers led me to a website Microsoft made to say goodbye to IE6: http://www.ie6countdown.com/

The site reports that in the US, IE6 has 0.6% market share — relatively nothing. But look over at China: 22.4% of its 500 million Internet users still browse with IE6. Moving forward benefits the Internet as a whole, but the Chinese market is one instance where backward compatibility is important.