Looking for a SharePoint portal demo site? - here is one - http://www.wssdemo.com/
And here is a huge list - http://www.wssdemo.com/Pages/websites.aspx

Also, do you know microsoft.com is done with SharePoint?

Here are some SharePoint community websites:

http://forums.microsoft.com/MSDN/default.aspx?ForumGroupID=328&SiteID=1
http://sharepoint.microsoft.com/sharepoint/forums/default.aspx
http://www.sharepointbuzz.com/
http://community.officesharepointpro.com/forums/
http://suguk.org/