Linq to XML in 3 easy stepshttp://www.dev102.com/2008/04/25/linq-to-xml-in-3-easy-steps
Linq to XML - Adding, Updating and Deleting Datahttp://blogs.microsoft.co.il/blogs/maordavid/archive/2007/10/13/linq-to-xml-adding-updating-and-deleting-data.aspx