PowerPivot videos on Microsoft Technet...
PowerPivot Part 1 - Loading Data
http://edge.technet.com/Media/PowerPivot-part-1-Loading-Data/
PowerPivot Part 2 - Preparing data
http://edge.technet.com/Media/PowerPivot-part-2-Preparing-data/
PowerPivot Part 3 - Analysis
http://edge.technet.com/Media/PowerPivot-part-3-Analysis/
PowerPivot Part 4 - Sharing in SharePoint 2010
http://edge.technet.com/Media/PowerPivot-part-4-Sharing-in-SharePoint-2010/
PowerPivot Part 5 - Management
http://edge.technet.com/Media/PowerPivot-part-5-Management/
