Linking over to a good article on PowerPivot and Analysis Services
As Microsoft PowerPivot is gaining more popularity and exposure, BI professionals ask more and more questions about PowerPivot’s role in the organization in trying to understand what value the new in-memory BI solution from Microsoft brings, along with the benefits and the limitations of it. Is PowerPivot going to replace SQL Server Analysis Services? If so, how soon? What should be done with the existing BI solution? Or maybe both can coexist and serve different needs?