I haven't ever done anything too significant in Haskell, but the Jekor Redo [1] videos are fantastic, and demonstrate the slow building up of more complicated things than "reverse this string." I haven't watched his xmonad [2] or pandoc [3] videos yet, but I would bet that they are highly worthwhile as well.

- 1: https://www.youtube.com/watch?v=zZ_nI9E9g0I

- 2: https://www.youtube.com/watch?v=63MpfyZUcrU

- 3: https://www.youtube.com/watch?v=nCwG9ijQMuQ

You may have seen this, but if you haven't, check out this video, 'John Carmack: Thoughts on Haskell':

http://functionaltalks.org/2013/08/26/john-carmack-thoughts-...

I it won't solve the problem you're having, but it's an interesting talk that's kind of related

The HN comments: https://news.ycombinator.com/item?id=6278047