Due to severely limited time and energy, I have not been actively learning and using Haskell for quite some time. In my heart, Haskell is one of my favorite programming languages. Heck, this blog is generated mostly using Hakyll.
As much as I like Haskell, I think it one severe weakness - poor documentation. The situation is getting better, but one more person helping won't hurt.
Below are just some small tips and tricks I've picked up, often the hard way, from use of Haskell. I hope you'll find them helpful.