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It depends on what do you want to do. Jacob Sebastian has a very good blog about XML and also I believe there was a quiz by him
Here is a link with a summary to all his XML labs:
http://beyondrelational.com/modules/2/blogs/28/posts/10279/xquery-labs-a-collection-of-xquery-sample-scripts.aspx
And this is the quiz on the topic of your question with answers:
http://beyondrelational.com/quiz/sqlserver/general/2010/questions/5/sqlserver-quiz-general-2010-jacob-sebastian-openxml-or-xquery-when-and-why.aspx
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