Very nice! I've never written anything in Haskell beyond configuring Xmonad, so I don't know if this is how it works in the Haskell-world, but presenting it this way (the "Robust"-section in particular) really gives me the feeling that this is a great platform to explore. Libraries are extremely important, and choosing between similar ones leads to anxiety.

I think many languages should take after this. If not distribute libraries with the platform (batteries included), at-least bless some libraries. It'd be so much easier to get started with some languages (cough, Erlang) if authoritative characters in the loop would share their opinions.