Excel currently does not have a formula to find unique values in a range. I
have needed to do this a number of times to provide useful analysis of data
sets. There is a way to find unique values by nesting several other
functions, however it is cumbersome to use and even more difficult to edit
correctly. Since the capability exists in a round about way, it should be
easy to craft into a stand alone function.

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http://www.microsoft.com/office/comm...heet.functions