Pivot tables created using Excel Data VERSUS Pivot Tables created using PowerPivot - Differences?

Can someone tell me what the additional features are between a pivot table created in plain vanilla Excel versus a pivot table created using PowerPivot.
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My understanding is that PowerPivot can handle more data and can bring it in from more sources. I believe that PowerPivot tables can be created by users and published to a Sharepoint site. I have not done that myself, so I am assuming it would use a data model to do that.

This is a good article - http://blogs.office.com/b/microsoft-excel/archive/2010/10/01/top-5-ways-powerpivot-helps-excel-pros.aspx

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