[^1]: Various extensions to Scheme are proposed as numbered SRFIs; the extension in question is SRFI 49, as defined by http://srfi.schemers.org/srfi-49/srfi-49.html
I can't find any direct connection to Racket, though, and it's not part of the Racket package repository.
The beginner track is very nice, taking you through the weird syntax, introducing pattern-matching with examples, and is relatively light on falsehoods.
In many respects, yes.
http://www.lispworks.com/documentation/HyperSpec/Body/03_aba...
There are differences of course which should be pretty easy to spot if you know lambda-calculus well.
There is Wisp (Whitespace to Lisp):
https://bitbucket.org/ArneBab/wisp
http://draketo.de/light/english/wisp-lisp-indentation-prepro...
(I have never tried it.)