The best (in my opinion) resources to learn Scala

Here are the best resources to learn Scala from scratch:

1. Tour of Scala.
   Quick and easy introduction to Scala from Scala creators.

2. Hands-on Scala Programming.
   The best book on Scala with focus on code and practical programming.

3. Scala is a Maintenance Nightmare.
   Article about "dark side" of Scala with self-describing title.

What would you suggest as good source of knowledge about Scala?