Weka and R Tutorial

World is amazing because of web. One can solve problems based on other's approach by looking them in web. One can teach what he knows to others by releasing article, audio or video lectures in web. Here I've found a very interesting site, SentimentMining.net, that is very useful for people who are interested in data mining or sentiment mining and statistical analysis. I particularly liked weka video tutorial in the site. It also has tutorials for R but I've not explored that much.