https://www.fpcomplete.com/business/resources/case-studies/

http://engineering.silk.co/post/31920990633/why-we-use-haske...

http://bos.github.io/strange-loop-2011/talk/talk.html#%281%2...

http://www.quora.com/What-startups-use-Haskell-for-productio...

http://www.quora.com/To-what-extent-do-people-use-Haskell-at...

https://angel.co/haskell/jobs

http://www.quora.com/What-is-the-largest-commercial-program-...

http://janrain.com/blog/haskell-janrain/

http://functionaljobs.com/

http://www.haskellers.com/jobs

And I've noticed "haskell" at least being listed in job postings more lately:

http://www.dice.com/job/results?caller=basic&q=haskell&x=all...

Such genuine curiosity.