Power Pivot is a great new utility for Microsoft Excel.
It's a plug in where Power Users can mash data sets and view in Excel Pivot Tables.
One thing that's kind of cool is mashing external data found on the internet.
One cool place to obtain that data is Azure DataMarket.
There, you can purchase or obtain free data for your mashing.
You can search for specific data types, run sample queries prior to purchase and then download.
Once downloaded, you can immediately begin mashing and slicing the data in Power View.
Tell 'em Jon sent ya!