Does anyone know of any advanced books on Haskell? Or can anyone recommend a good source of information on producing applications written in Haskell? I am a third year undergraduate student at Leicester University, and am aiming to use haskell, combined with the Haskell-Tk binding developed by Einar Karlsen to produce an application using Haskell (for my dissertation). I have a number of books on Haskell, but all are aimed at learning the basics of the language, rather than on how to build useful systems with it. Any source of information on using Haskell for application building would be really appreciated (or am I on my own?) cheers, Joel.