Ask HN: Recommended Scala resources for beginners.

To make it clear, I'm not a Scala beginner. I was familiar with Haskell and Ocaml before I started using Scala, and I was familiar with the JVM via Clojure. So I learned most of Scala pretty quickly and might not be the best judge of which resources are good and which not from the perspective of a beginner, or someone who's only used Java.

I've read Odersky's book (and thought it was great, although a bit large) and own a copy of (but have not finished) Programming Scala, the O'Reilly reference.

Those two books are good, but large, and it seems that there are few strong and quick Scala resources for beginners, and fewer free ones.

Does anyone have any recommendations? I'm going to be teaching a lot of people Scala over the next few months and I'm curious about what resources are the most efficient (and, if anyone has data, how long it takes people to learn from them).