"I can honestly say if someone had shown me the Programming Scala book by by Martin Odersky, Lex Spoon & Bill Venners back in 2003 I'd probably have never created Groovy." -- James Strachan
2 years ago CEO of Groovy/Grails company SpringSource jumped ship and ended up at Typesafe, the Scala company. That incident gives a good idea of where the wind's blowing.