I think of the Data Mining Addins for Excel 2007, as data mining tools for common man - they allow anyone to use SQL Server Analysis Services without having to know how to program the backend. It allows you to look for Key Influencers, Detect Categories, Highlight Exceptions, etc. This can be a real benefit for scientists looking to do things like data cleaning directly from Excel.
This is great news - Software-plus-Services that any scientist/researcher could use.  The SQL Server