Here and you need a live or hot mail account....free sign up of course.
http://www.microsoft.com/windows/windows-7/beta-download.aspx
http://www.microsoft.com/windows/windows-7/beta-download.aspx
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature currently requires accessing the site using the built-in Safari browser.