David Pollack: "We can argue about whether Scala is syntactically simpler than Java. I find that my code - I did two years of Ruby On Rails work before I did Scala and I've done Java work since 1996 - I find that Scala is as concise as Ruby. I also find that Scala's type system doesn't often get in my way. Where I have to declare types in Scala is where I should document types in Ruby, and I can also use the type system as a way of defining tests. Scala's design lead to Lift's design. Lift's design lead to abstracting away HTTP in a way that we can do real time, or what appears to be real time, push, in a way that's syntactically and semantically pleasing for the end developer."
My observation here is that the last language I found as interesting as Scala was Python. They reel you in.