Database denormalization is also used in the context of data warehousing. Often the normalized OLTP model will get denormalized into a star schema with Fact and Dimension tables. This type of model makes reports run faster due to less joins. Data duplication is no longer a concern in a DWH.
See also [Denormalization (Wikipedia)][1] and [Lesson 3: Optimizing the Database Design by Denormalizing (TechNet)][2]
[1]: http://en.wikipedia.org/wiki/Denormalization
[2]: http://technet.microsoft.com/en-us/library/cc505841.aspx
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