I'm guessing most people on this list don't need to learn Scala. ;)
If you have a friend who wants to learn, though, I've written a blog where I suggest a learning path and a list of free resources for getting you from knowing nothing about Scala to being reasonably proficient.
http://www.grahamlea.com/2012/11/learning-scala-grahams-guide/Note that it assumes previous knowledge of programming.
Cheers,
Graham.