Charles Nutter (JRuby specialist at Sun) said recently:
"The CLR kind of grew up on the static language side of the world, from the C++ folks, whereas Java grew up on the Smalltalk side of the world. It was actually grown out of a Smalltalk VM. So what we have on the JVM, oddly enough, is a dynamic language runtime under the covers powering a statically typed language. The work that we are doing in future versions of the JVM and the work that we're doing with JRuby and the current set of dynamic languages is essentially exposing that capability to run dynamic languages extremely well to all of the different language implementations."
Makes you wonder what would be the ideal dynamic language to run on the JVM, doesn't it?