London Haskell user group, 24th October 2012. A talk by Derek Wright, based on a blog post by Chris Smith.
Blog Post:
http://cdsmith.wordpress.com/2012/04/18/why-do-monads-matter/
Code on GitHub:
https://github.com/londonhaskell/londonhaskell-2012-10-24-why-do-monads-matter
PDF with animations (for on-screen viewing):
http://files.londonhaskell.org/2012/10/24/WhyDoMonadsMatter-WithAnimations.pdf
PDF (with most of the animations removed for printing):
http://files.londonhaskell.org/2012/10/24/WhyDoMonadsMatter.pdf
PowerPoint Presentation (with all the animations!):
http://files.londonhaskell.org/2012/10/24/WhyDoMonadsMatter.pptx