BI - PowerPivot for Excel - TechNet page
Microsoft PowerPivot for Excel is an add-in that you can use to perform powerful data analysis in Excel 2010, bringing self-service business intelligence (SSBI) to your desktop.
This TechNet page contains resources on getting started with PowerPivot for Excel and links to different PowePivot related blogs and websites.
Tags: introduction, setup, dax, video, excel