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I think, to most people, scripting is a lot like obscenity. I can't define it, but I'll know it when I see it. [...] If I had to pick one metaphor, it'd be easy onramps. And a slow lane. Maybe even with some optional fast lanes.
Larry goes through tons of different older languages commenting on their viability in the online community including: Javascript, LISP, Pascal, Python, Ruby and PHP. He then looks at the present and what sorts of things are happening in languages these days. This list includes things like early binding/late binding, eager typology/lazy typology, limited structures/rich structures, class-based/prototype-based and transaction/reaction/dynamic scope.