Caret (http://caret.r-forge.r-project.org/ http://caret.r-forge.r-project.org/) is another package that should make the list, if you are using machine learning

Caret (http://caret.r-forge.r-project.org/ http://caret.r-forge.r-project.org/) is another package that should make the list, if you are using machine learning packages in R. Caret gives you a common interface to you use a huge list of classifiers. Plus, it has some nice functions for data preparation.