Thanks for the link! I am taking Andrew Ng's Coursera class now - homework due today. I am finding it to be a good introductory class. I think probably equivalent to an introductory undergraduate class. This is perfect for me because my formal calculus and statistics skills have a atrophied in the 10 years since I took those classes in college. The pace is enough to push be to get back into math shape and learn some base algorithms used in ML applications. I have bookmarked this for follow up since I have a practical need to get deeper into ML.