The Data Mining Institute - http://www.datamining.org/

Commercial

The Data Mining Institute is a non-profit organisation aiming
to bring together data mining corporate users and main market players
(tool and service providers).
Acting both as an observer and a consulting institute, the association
has two main goals: to promote optimal applications of data mining and
assist users through the different stages of the data mining process.

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Note: This info converted from the original "The Data Mine" pages and pre-dates June 2001. Please remove this note if you update or check the info