Microsoft recently launched their new SharePoint marketing site on none other than SharePoint itself. Its jam packed with Silverlight and cool menus inlcuding something called a Hero Bar :-) along with Custom Page Layouts and Style Sheets with Targeted Audience content based on your skill level. Very cool indeed.
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You can check the site out at
http://sharepoint.microsoft.com/Pages/Default.aspx
and see how they did it at
http://blogs.msdn.com/sharepoint/archive/2009/06/18/how-we-did-it-sharepoint-microsoft-com.aspx
MarcL