1. Scala Tour
http://www.scala-tour.com/
2. Scala Tutorials
http://docs.scala-lang.org/tutorials/tour/tour-of-scala.html
3. Scala Cheatsheet
http://docs.scala-lang.org/cheatsheets/
4. Scala School
http://twitter.github.io/scala_school/
5. Scala Tutorials by code
http://scalatutorials.com/tour/
6. Learn Scala in 10 minutes
http://learnxinyminutes.com/docs/scala/
7. Scala by Example
http://www.scala-lang.org/docu/files/ScalaByExample.pdf
8. Scala Overview on StackOverflow
http://stackoverflow.com/tags/scala/info

书：
1. Programming in Scala: A Comprehensive Step-by-Step Guide, 2nd Edition
2. Scala in Action
3.http://www.atomicscala.com/book/