Microsoft has released a new web development environment (like java or Flash) called Silverlight and from all reviews, it will be a major development for the web. Initially this will be most exciting for developers, but better content is better for the user in the end. Faster more reliable web applications on the way and my bet is that in less than a year "Sliverlight" will be as household nameish as Java, PDF, or Flash. We'll see.
http://www.techcrunch.com/2007/04/30/silverlight-the-web-just-got-richer/
