I had a look at the Cheat Sheet - many thanks it is exactly what I need. I have some basics with Haskell and as you said it is a nightmare to figure out what the operators are doing. I am still working through Real World Haskell, the book is really good - but what I miss is this kind of short reference (well, the cheat sheet being 14 pages, it is not really short).

Thanks for this link!