FP Complete's online Haskell IDE is now free for community use (try it)
fpcomplete.com
fpcomplete.com
I'd recommend:
1. Open Learn You a Haskell in a window: http://learnyouahaskell.com/
2. Open up anything that takes your fancy from the tutorials: https://www.fpcomplete.com/school/starting-with-haskell (they have interactive snippets)
3. Open up the IDE in another window.
Start learning and playing!
It's a full IDE with sweet Haskell-specific features like built-in Hoogle and type information of any sub-expression. This is SOOO nice for learning.
Similar to Github, for extra features there's a 9.99/mo upgrade. And coming next month is external editor support for the hardcore Emacs/Vim/Sublime. I work at FP Complete, so if you have questions, feel free.