Note that this is a series of posts. The first post that is being linked to doesn't have much IMO.
http://ericlippert.com/2013/02/21/monads-part-one/
http://ericlippert.com/2013/02/25/monads-part-two/
http://ericlippert.com/2013/02/28/monads-part-three/
I wasn't clear for me but in the last post he mentioned that there would be more posts to come.