Part of his summary:
Developer productivity is not to be dismissed lightly. Ruby has a leg up on Java right now because it is inherently a better language. But it is far from a better platform right now, which is unfortunate. So the question is: Which will happen first? Will Ruby get the tools, or will Java get its act together and catch up to Ruby? One, if not both, are bound to happen soon, and no matter what the developers will win.