The online book Real World Haskell[1] has used a more integrated form of annotation via comments directly under each passage. It's pretty fun to observe how the

The online book Real World Haskell[1] has used a more integrated form of annotation via comments directly under each passage. It's pretty fun to observe how the comments play into the content...sometimes they're wonderfully constructive and other times they derail more useful discussion. It'll be exciting to see how these social norms evolve with the technology. [1] sample chapter, http://book.realworldhaskell.org/read/programming-with-monads.html http://book.realworldhaskell.org/read/programming-with-monad...