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Scala is reaching a tipping point, as thousands of Java and other
object-oriented programmers hear about its potential and seek to
discover this breakthrough functional programming language for
themselves. Until now, most treatments of Scala have been abstract and
academic. Now, Cay Horstmann does for Scala what he did for Java in
his global best-seller Core Java: he offers a rapid, code-based
introduction that's relentlessly practical and 100% useful. Every
concept and technique in Scala for the Impatient is presented in "blog-
size" chunks that can be digested quickly and reviewed as needed for
specific tasks. Horstmann offers hands-on activities that guide
readers through four well-defined stages of competency ...
http://typesafe.com/resources/scala-for-the-impatient