The site features a new layout, with more focus on directing users towards security and feature updates like service pack 2 for Windows XP. The navigation also appears clearer, allowing easier access to the many parts of Microsofts site.
One problem that still remains, however, is the sites lack of standards compliance. It doesnt validate to the very basic (and somewhat aged) 4.01 HTML standard. Also, the site appears quite different in non-IE browsers - Firefox users dont see all elements of the site, and they also enjoy "poor" images due to DHTML image rendering filters. See this post for more information.