Anyone taking bets on whether these features will have any compatibility with Microsoft's msSiteMode API in IE9?
http://areweprettyyet.com/5/desktopApps/
...which links to bug 605222, "add support for .website shortcuts, msapplication meta information in Windows 7":
https://bugzilla.mozilla.org/show_bug.cgi?id=605222
...which links to the exact MSDN page you're talking about.