Under button named "Comparison" you can find compassion of data mining software. There is list of methods used by programs for classification, regression and how its handle missing data. It's made for prof. Włodzisław Duch.

Second button "Weka" - there is description of few methods used in Weka. You can find there description of parameters, but for now its only in polish - sorry. It'll be changed next time. It's still under construction.