PivotTables Tutorial

Now that SE (PRO version) allows to export your pro sales data into Excel-compatible CSV files, what are you gonna do with all this vital information?
The answer is: Pivot it!!
Learn online in less than 30 min how do deal with this extremely power part of Excel - straight from Redmond wizards:
Microsoft Office Training: PivotTable I: What's so great about PivotTable reports?