"I don't understand, why would anyone want to generate javascript from S-exprs? I understand this is fashionable in the CL world, but I've never seen any good j

"I don't understand, why would anyone want to generate javascript from S-exprs? I understand this is fashionable in the CL world, but I've never seen any good justification for this practice outside of saying, "Now everything is in lisp."" No, that is the justification behind things like GWT which are written by people who don't know web programming for people who don't want to learn web programming. The point of having everything in Lisp is enabling the possibility of building your application in terms of domain concepts (I want to say "DSL" here, but the problem is that the term DSL has been coopted by Java morons who think it means something like scripting language). The difference with other single-language systems like GWT is that this is done using macros - you're translating domain concepts directly to the JS+HTML+CSS target, instead of trying to shoe-horn them into some brain-damaged OO layer that may or may not need runtime support. It's not about "abstracting the web," (abstracting to what? "Abstracting" JavaScript to Java is going from dumb to dumber); it's about the domain.