Also here is the link to my simple example of using Caret for Random Forest on the Iris data set.
Caret is so much more than just Random Forest. It can do a lot of preprocessing with things like centering and Scaling. Also there are almost 200 other classification models in Caret other than Random Forest. Caret has really become the deficit tool for establishing the baseline for the predictive power of a dataset and building out a superior parsimonious model.