The free course is online. Let me give the backstory, which I hope will clarify things: I'm giving a talk at Strata London (a "Big Data" conference) in a few

The free course is online. Let me give the backstory, which I hope will clarify things: I'm giving a talk at Strata London (a "Big Data" conference) in a few months. I won't be able to go into details for the talk, so I want to create supplementary material. I seems sharing this material online will be good for others (and for me). I don't want to plonk it all on the web because 1) I don't want to make all my material available till after the talk and 2) I want to build a mailing list of people interested in this kind of stuff. I may build the material into a more formal course if there is sufficient interest.