You may have noticed that www.microsoft.com has been redesigned.
Here is a kicker from http://www.microsoft.com/about/mspreview/en/us/abouthomepage.mspx
"In the background we are beginning to migrate much of Microsoft.com to a new platform based on Microsoft Office SharePoint Services 2007."
Now, microsoft.com is one of the top 10, if not the top 5 sites in the world. If this isn't an endorsement on the capabilities of SharePoint 2007, I don't know what is.