Niner since 2010
I am really enjoying the presentation! This type of popularisation is so much harder than presenting the formal view that one can find in any paper with monad in the title. Please stay on course!
Really enjoyed the lecture. People might also want to check out Dan Piponi's "monads as trees" http://blog.sigfpe.com/2010/01/monads-are-trees-with-grafting.html. Also this talk is a must see: http://vimeo.com/6590617.
: Spivak's "Calculus on Manifolds" is a good start.