bitemyapp has written a great overview of popular books/sources about learning Haskell. - http://bitemyapp.com/posts/2014-12-31-functional-education.html
Last time when I tried to get into haskell (3 years ago), there was less information about it. LYAH, some blog posts and one book by Roman Dushkin. That's it.
Now we have much more information (books, courses, etc.) but it seems that 'quality' is a constant.
Yesterday I got a new book: Beginning Haskell: a project-based approach. Let's see whether it can level up 'quality'?