This is a really great addition to iTunes U. Skipping through the videos, the course appears to give a thorough treatment to the theoretical background of probability. I haven't seen too many intro probability courses explore topics such as Beta Distributions and Markov Chains with this much rigor. I hope Harvard does the same for Stat 111 and Stat 171.

Edit: I just skimmed through some of the assignments and tests, and thought they are really good! If its been a few years since you took probability/statistics and feel you may be rusty when it comes to the integration and manipulations, give them a try! Homework 9 and 10, especially.