Check out this posting from Steve Caravajal http://blogs.msdn.com/scaravajal/archive/2006/09/19/762603.aspx that has a link to an Excel spreadsheet with a heads up comparison of

• Windows SharePoint Services v3


• SharePoint Portal Server 2003


• Office SharePoint 2007 for Search


• Office Forms Server 2007


• Office SharePoint Server 2007 Standard CAL – MOSS Standard


• Office SharePoint Server 2007 Enterprise CAL or for Internet Site

Great find!

1/24/2007 EDIT Here is a link to a web page view of essentially the same information.  http://office.microsoft.com/en-us/sharepointtechnology/FX101758691033.aspx 

Shane – SharePoint Help