So you have always been able to hook excel into sql server. In the past the excel user would royally annoy the IT groups (and or the DBA groups) by connecting to sql server tables, querying massive amounts of data, process this with excel to produce a report that a DBA could have done with 3 lines of sql code and not pummel the sql server into the ground with horrible queries. Powerpivot solves all those problems and still allows the excel users to create rich full dataset reports. Powerpivot also works on sharepoint server so you can promote someone's excel report into an actual server based solution (rather than 50 people running the same queries against the database). Powerpivot is both user and admin friendly. There should not be any additional support requirements by default. In many cases it's advantageous to publish a schema for common data sources so users know which sources contian the right data. A hands on lab is available here