A new version of the "Effective ML" talk I (Y. Minsky) gave at Harvard last year. This one covers the basic material of the talk in more detail, and doesn't get to talking about phantom types, which was an advanced topic covered at the end of last year's talk.
In this talk Coda Hale and Ryan Kennedy give an overview of "Streamie," the Riak-backed notifications service they recently built and put into production at Yammer.