I've been trying on and off to get my head around continuations in Scheme, which is the language that gnucash uses for reports. It's one of the modern versions of Lisp. And then I came across a throwaway line in the YQL documentation about JSONP with a callback is a also called continuation-passing style. A little Googling finds this fascinating lecture by Douglas Crockford, a short summary by John Lam that makes it clear that the continuation idea is obvious to anyone who's done any asynchronous Javascript like AJAX, and a more intellectual discussion by Matt Might that goes through the Lisp side.
Now that it turns out that I already understand continuations, I'll have to go back and prove that to myself. And yes, Javascript is Lisp in C's clothing.
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