oh, yes, indeed, the ->> macro is slick. reminds me of the bind operator in haskell. i don't know why i haven't seen something like it in other lisps. but as you said, that's part of the language.

anyway, should clarify: i'm interested in libraries that define and then use lots of macros in order to solve a specific problem. i'd like to know what problem domains are particularly well suited to the sort of language extension that macros provide.