Beth Massi posted nice presentation on Ling to XML on Infoq.com.
http://www.infoq.com/presentations/massi-linq-xmlShe also rights regularily on her blog "Sharring the goodness tha is VB" -
http://blogs.msdn.com/bethmassi/VB.NET 9.0 has nice syntactic sugar tha C# 3.0 don't have for working with XML and Linq.
Using XQuery to Manage XML with SQL Server 2005
http://www.informit.com/articles/article.aspx?p=468058
XQuery 1.0: An XML Query Language
http://www.w3.org/TR/xquery/
XML Support in Microsoft SQL Server 2005
http://msdn2.microsoft.com/en-us/library/ms345117.aspx
Performance Optimizations for the XML Data Type in SQL Server 2005
http://technet.microsoft.com/en-us/library/ms345118.aspx