As I'm in the mood for finally responding to frequent requests, here is a list of case studies referring to SQL Server Data Mining on Microsoft.com. Note that these are "marketing" case studies and are notoriously sparse on details, and that's aggravated by marketing focusing more on the relational engine than the data mining engine (in fact many of them refer to data mining without any details, but so is life). In any case, you can use these whenever you get a response such as "but how do we know if SQL Server Data Mining is enterprise ready?" or "But does anyone like us use SQL Server Data Mining?" or similar questions.