Hi all, I've written a Haskell tutorial that walks the reader through the implementation of a Scheme interpreter: http://halogen.note.amherst.edu/~jdtang/scheme_in_48/tutorial/overview.html Instead of focusing on small examples at the Haskell REPL, it tries to show the reader how to construct a real program with Haskell. It introduces monads and IO early, and also includes error checking, state, file I/O, and all the other "hard stuff" that's frequently omitted from beginner tutorials. Am looking for feedback on two main axes: 1.) Experienced Haskell users: is this more-or-less idiomatic Haskell? Did I miss any library or language features that could make the programmer's job easier? It was my first substantial Haskell program, so I worry that I may have missed some common ways of doing things. 2.) Novices: is it clear and easy to understand? I had a tough time figuring out how to do anything practical in Haskell, because most tutorials omit IO, gloss over monads, and don't pay any attention to state or error-checking. Does this rectify those shortcomings? Comments/critiques are appreciated. Regards, Jonathan