Great talk! I did a quick one-weekend evaluation of Cascalog a few months ago; I wish I could have first watched this video as a good introduction.

Great talk indeed. Note that most (all?) the material covered in the talk is available from the tutorials referenced on the README of the project on github: http://github.com/nathanmarz/cascalog

And the demo project: http://github.com/nathanmarz/cascalog-demo

It's worth noting that the video/talk also provides a fairly good crash course on Clojure.