I just received a copy of the 4th Data Miner Survey report from the Rexer Analytics people. The survey has been participated by about 735 data miners from 60 countries. I am interested in data mining algorithms section of the report which stated that decision trees, regression and cluster analysis continue to form a triad of core algorithms for most data miners.
For a complete list of data mining algorithms used by most data miners in 2010 can be seen as below: