http://blogs.msdn.com/b/shawnfa/archive/2004/03/30/104425.aspxThe new XML Developer Center on MSDN has a nice article about the new XML features in Whidbey . The top 10 list is: Performance XPathEditableNavigator, an Updatable Cursor The XPathDocument as a Better DOM Easier XPath Queries with Namespacesen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)