Haskell is like the Emperor's New Clothes of programming.
Only people who are very smart like to program in Haskell, ergo, every programmer pretends to like Haskell (while actually implementing everything in Python or Perl). I've never used a bit of useful software actually implemented in Haskell, though.
Yeah haskell pretty much doesn't have much in the ways of software out there.... but.... If you are talking about gpgpu and financial software, there is a lot of stuff built in haskell in those fields.