When publishing Excel Workbooks that contains PowerPivot objects, a real Analysis Services cube is generated on the fly, you don’t believe me?
1. Install the PowerPivot Add-in for Excel 2010 and use it to create a workbook.
2. Publish the workbook to a document library which is marked as a trusted data source (Unlike MOSS 2007, All SharePoint sources are trusted by default in SharePoint 2010 as shown below).
3. Open SQL Server Management Studio, click Connect > Analysis Services and type the URL of the workbook you just published and click Connect.
Interesting, eh ?
Ayman El-Hattab's Technology Blog 