Clojure just might become a popular lisp. :-) In terms of Scala, it's built on top of the JVM (as is Clojure) and so it's underlying model is the same -- Java

Clojure just might become a popular lisp. :-) In terms of Scala, it's built on top of the JVM (as is Clojure) and so it's underlying model is the same -- Java threads mapped to OS threads. Scala does give people a variety of syntactic constructs.