There was a cool talk on "The Haskell Chat" episode two [1] that goes over how haskell is used in a large team, some members with expert haskell knowledge, some as just technical end-users of the libraries.

I found it really interesting to see how a large team can deal with a real haskell project.

[1]: http://www.haskellcast.com/episode/002-don-stewart-on-real-w...