Artyom, the Haskell programmer who's documenting his experiences learning Racket now has a second instalment, mainly about macros: http://artyom.me/learning-racket-2. I can't comment authoritatively on the content -- because of my current own level of macro bafflement -- but it reads as a good illustration of how one capable person approaches learning Racket macros and makes progress.
Dan
____________________ Racket Users list: http://lists.racket-lang.org/users