Jeff we have seen this same loop in several threads in the last day or two. Chris posted a great solution on one of them that got rid of the nested loops. The one posted here seems to be a shortened version of the others.
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Cross Tabs and Pivots, Part 1 – Converting Rows to Columns - http://www.sqlservercentral.com/articles/T-SQL/63681/
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Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/