Here is February 23, 2011 Lecture by Prof. Ram Akella (UC Santa Cruz) on Data Mining, covering Naive Bayes (first part) and guest lecture on Crowd Science (2nd part)
Here are previous lectures
Feb 16 Data Mining Lecture, covering Classification methods: k-nearest neighbors, Naive Bayes.
Feb 9 Data Mining Lecture, Naive Bayes
Feb 2 Data Mining Lecture, Introduction, R, Logistic Regression