Here
is a useful wiki page on Haskell.org covering a lot of what is going on with Haskell and linguistics.
There is also
this
recent book on computational semantics in Haskell.
This
is a book in progress about Haskell applied to NLP in general that you can currently read online.
The Grammatical Framework
is a tool built in Haskell which is based on some neat ideas usually employed in programming language theory, namely dependent type theory and logical frameworks. Its main application is multilingual machine translation.
This
is a great book to learn beginning Haskell, and
this one
is a great second book (or first really). They are both freely available online.
-- Main.casonj - 2012-04-20