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Blog comments are actually worth reading.
Link is to a message from Jay McCarthy, discussing why continuations are a nice way to solve session management.
This page has some solid but informal docs and a bunch of examples. There's also a [paper from the 2013 Dynamic Languages Symposium](http://hashcollision.org/whalesong-paper/paper.pdf).
Konrad Hinsen (author of [MMTK][mmtk] molecular modeling toolkit in Python) investigates Racket for use in computational science.
[mmtk]: http://dirac.cnrs-orleans.fr/MMTK/
Beautiful Racket preview: Make your first programming language — in one hour
(beautifulracket.com)