MLnet Mailing List  
   A moderated list, dedicated to the area of machine learning, knowledge discovery, case-based reasoning, knowledge acquisition, and data mining.
   http://www.mlnet.org/mlnet2/services/mlnet-community.html

Machine Learning List  
   A moderated discussion list about Machine Learning. Email subscribe/unsubscribe request to ml-request@isle.org. Email contribution to ml@isle.org. It's sent out bi-monthly in digest format.
   http://www.ics.uci.edu/~mlearn

Recursive Partitioning Mailing List  
   An unmoderated mailing list for recursive partitioning based supervised learning methods, a.k.a. classification and regression trees.
   http://groups.yahoo.com/group/recursive-partitioning/

Machine Learning Mailing List  
   An unmoderated mailing list intended for people in computer sciences, statistics, mathematics, and other areas or disciplines with interests in Machine Learning. Researchers, practitioners, and users of Machine Learning in academia, industry, and governm
   http://groups.yahoo.com/group/machine-learning/