When you create a new PowerPivot site and go to Power Pivot Gallery, you find the “New Document” disabled by default.
Go to “Library Settings”
Click on “Advanced settings”
Choose “Yes” in “Allow management of content types?”
I just finished our event in Riyadh SharePoint User Group Meeting September 2012.
Megren & Me, lets the first two hours for open discussion questions and most of audience shared us with answers and question.
Then, Mr.Sayed presented BI in SharePoint 2010 and especially Performance Point (Business Intelligence (BI) with PerformancePoint in SharePoint 2010).
After that, Mr.Waqqs talked about SharePoint-Governance-2.
Below is some of our pictures in that event.