Metro Dynamis is an early alpha release library based on JQuery for designers and developers wishing to build HTML5/CSS/JavaScript websites in a style similar to the Metro UI used by Windows Phone 7 and Windows 8. You can get an early look at it by signing up for the newsletter.
Meanwhile, some members of the Microsoft Platform and Tools team, spearheaded by Mads Kristensen, has released a package that adds improved support for HTML5 within Visual Studio.
ZDNet’s Mary Jo Foley points to a post by Scott Hanselman containing a few screenshots of the HTML5 update in action.