For the "real world" applications I think you should at least consider Scala and Clojure also. Because they're both JVM based you can rely on the Java infrastr

For the "real world" applications I think you should at least consider Scala and Clojure also. Because they're both JVM based you can rely on the Java infrastructure that's been built up over the past 15 years. If you're doing web development, or network applications, NodeJS is also notable, there's a reason it's getting a lot of attention lately, the fun-factor is just off the charts.