Wow I've gotta say, this looks great.

Something that bugs me is I couldn't copy the code in the upper right to the code "try it" section. I haven't used haskell for 6-12 months, so I'm not sure what I'm doing wrong.

Here's a screenshot: http://imgur.com/N2SdFVq

Regardless of how to fix this, I think something should be changed so this can't be someone's first impression.